Chalk Style Paint

All bright white paint will yellow slightly with time, even without topcoat. You have probably tried to touch up white woodwork in your home after several years and noticed that the new paint is brighter.

But white and light paints can react if clear coated with a waterbased finish; water-based topcoats are reactive and may draw out substances in the wood such as tannins, dyes or unknown substances in existing finishes causing the topcoat to yellow. This is an industry-wide issue and can happen right away, years later or never.

There is no way to reliably predict yellowing ahead of time. Every existing finish is different and we rarely know the finishing provenance on a previously finished piece. Every tree is different; every piece of wood is unique. Wood can bleed tannins immediately after the topcoat dries or months later with a change in temperature that comes with a change in seasons. Oak, pine, mahogany, and Douglas Fir are particularly prone to bleed-through.

Throughout all of our testing, General Finishes water-based topcoats are clear drying over a non-reactive substrate such as plastic or metal but when applied to something as unpredictable as wood, it is best to play it safe.

To reduce the occurrence of yellowing, we formulated Stain Blocker, a chemical stain and tannin blocking primer, and Brushable White Enamel. But the safest route is no use of topcoat over whites and light paint. As all of our white pigmented paints are self-sealing and do not require a topcoat, we warn users as follows:

CAUTION: Do NOT use any water-based clear coat over bright whites such as GF Snow White Milk Paint, or GF White Poly as it may cause yellowing. Lighter-colored paints may alter slightly with a topcoat application, but the color shift is less noticeable. Any clear coat can become reactive over wood substrates or existing finishes, causing tannin or dye bleed-though regardless of priming. All of GF's white paints do NOT require a topcoat.

TIPS FOR PROTECTING YOURSELF AND PREVENTING YELLOWING

1. Don't apply any clear coat when using light or white paints. Topcoat is perfectly fine over darker colors.
2. Always prime white paint with a paint system: Gf recommends either 2 coats of Stain Blocker or White Undercoat.
   • Over raw wood: Apply two coats of Stain Blocker or Enduro White Undercoat, then 1-2 coats of Brushable White Enamel, White Poly (spray only), or Milk Paint.
   • Over an existing finish: Apply two coats of Stain Blocker, then 1-2 coats of Brushable White Enamel, White Poly (spray only), or Milk Paint. Always let any primer dry overnight. Many primers suggest a 3-hour dry time and that is not enough.
3. We offer three types of self-sealing pigmented paint.
   • Milk Paint: A clear topcoat is not required on our Milk Paint for increased durability. It is a self-sealing, exterior rated coating with very high-performance properties. However, higher sheen topcoats provide a smoother surface that is easier to clean for high use projects such as tabletops and kitchen cabinets. Topcoat is fine for darker colors, but not for light or white Milk Paint. In those cases, use Brushable White Enamel (available in Satin or Semigloss) or spray our pigmented White Poly (available in Flat Satin or Semigloss.)
   • Enduro White Poly: Use a professional sprayable "white coat" such as our professional Enduro White Poly. It is a white paint with "increased topcoat properties", is a stand-alone finish when 3 coats are applied and does not require sealing with a topcoat.
   • Brushable White Enamel was developed as a stand-alone finish for those who want a bright white but do not use spray equipment.
4. Use disclaimers in your contracts. Upcharge for the extra coats needed and never guarantee a white finish over a piece when the customer wants a topcoat. Here is a suggestion for your contracts: 
   
   Terms of Agreement and Warranties: ________ (Initials) I have been informed that more coats are required when painting with bright whites, reds, greens or yellows. I understand that white paint can yellow over time and water-based topcoats can react with the substrate or existing finish under white paints causing yellowing, even if a stain-blocking primer is used. I have been informed that topcoat over white or light paints should NOT be used.
5. Always test your project's ENTIRE finishing schedule (from cleaning to topcoat) on an inside door or a more hidden area of the piece. This does not help if the yellowing occurs later but you will at least know if there is an immediate problem.
6. If you are working on period pieces such as a 1940's serpentine mahogany desk which were often finished in stain containing aniline dyes that cast a pinkish bleed-through under light paint, stay away from light colors. Not every piece of furniture is suitable for up-cycling with a light paint color. Pine, Mahogany, and furniture of the 1940's and 50's are a red flag.
7. Last, not all manufacturer's topcoats are compatible with other finishes and may react with a color change. Always follow best practices by not rushing, and testing to your satisfaction first.

WHAT YOU NEED TO KNOW ABOUT WHITE PAINT:

• Bright white paints can yellow over time with or without topcoat. It is the nature of oxidation.
• The underlying finish or wood species can affect the final color of light paint.
• Details and inside corners are difficult to cover with any paint color, but this property tends to be more noticeable with whites. This is a naturally occurring phenomenon in paint application and does not necessarily constitute a defect in the paint finish or your technique.
• The more porous the paint (chalk paint vs an acrylic paint), the more likely that yellowing will occur. The topcoat is actually seeping through the spaces caused by the larger particles of filler that give chalk style paints their texture.
• Whites have a lower “hide” quality and are more transparent than other colors. Most bright whites require additional coats to achieve the desired color and minimize color variation. This can increase the cost of paint finishing. Always include a clause in your contracts addressing the need for additional coats to achieve coverage.

IF YOU ARE A PAINTING PROFESSIONAL, DO NOT CARRY THE COST OF WHITE PAINT YOURSELF

Include the cost of the increased labor for applying white paints with a fair, reasonable up-charge. White paints, even if they did not yellow, require more coats and high-quality primers to achieve coverage. See our video How to Achieve a Bright White Finish that Lasts for more information.

If your white cabinets have yellowed, we recommend prep cleaning and scuff sanding, applying a coat of General Finishes Stain Blocker primer, finish sand and re-coat with another coat of paint.

Watch "How to Get a Bright White Finish" to learn more.

The separation is a condition the paint industry calls "float." This is typical with specific colors, such as grays, because of the large variance in the gravities of the pigments required to create those colors. In gray, for instance, Ti02 (white) is 3.4 and black is 1.62. The lower density will float.

This phenomenon will not occur in colors with less variance in densities. Float is not unique to General Finishes products.

Always stir the paint well just BEFORE and DURING use. If there is any delay, the ingredients will start separating. If it is a large project, we recommend continuing to stir throughout use to keep color properties consistent.

A primer is your best defense under light-colored paint.

Another technique to avoid the slight color change that sometimes occurs when applying topcoat is to add 10-15% of the paint you are using to your topcoat. This technique layers additional coats of color over your piece as well as providing the protection of a topcoat. If you don't like measuring, just add enough paint until you can see a bit of the hue in the topcoat. This method works with a brush or a spray gun.

To maintain the full-strength protection of the topcoat, DO NOT TINT YOUR FINAL COAT of topcoat.

Remember, NEVER EVER paint an existing piece of furniture with a light paint without proper preparation AND a stain blocking primer. Topcoats can activate tannins in the wood, or dyes in the previous finish, causing yellow or pink bleed-through. We recommend General Finishes Stain Blocker, which has been developed specifically for upcycling furniture and has proven to be 100% effective when two coats are applied, or Zinsser BIN.

Here is a sample finishing schedule:

1. Prep clean and sand
2. Three coats of paint (or four if needed)
3. Two coats of topcoat mixed with 10-15% paint
4. One coat of topcoat

VIDEO: How to update or refinish cabinets and woodwork light paint color using a sprayer.

The word "latex" is often a misnomer and is used everywhere to differentiate a water-based product from an oil-based product. The same as the word “Kleenex” is used to describe any type of facial tissue, regardless of the brand.

Today, "latex" is the technical term for a suspension (U.S.) or emulsion (European) of microparticles in water.

Latex (a plant-based derivative) was never one of the early ingredients used as a binder, the material that holds all the ingredients together and imparts adhesion, in paint. Binders that are commonly used include synthetic or natural resins such as alkyds, acrylics, vinyl-acrylics, vinyl acetate/ethylene (VAE), polyurethanes, polyesters, melamine resins, epoxy, or oils. Acrylic paint is called that because an acrylic resin is used and not all resins are equal.

CAN I USE “LATEX” WALL PAINT FOR FURNITURE?

Yes, you can. You should differentiate between the “standard” wall paints and the “performance” wall paints, such as Advance by Ben Moore.

The problem with “standard" wall paints is performance. The majority of latex wall paints are designed and engineered for a different purpose: and that is to have great coverage…..on a wall.

Walls simply don’t have the wear and tear that other horizontal surfaces do, so wall paints are manufactured with fewer resins and more of the cost competitive fillers. This helps keep the cost down, which makes sense. 

WHAT IS THE DIFFERENCE BETWEEN 100% ACRYLIC WALL PAINT AND 100% ACRYLIC FURNITURE PAINT?

The first is the quality of the resin.

There are thousands on the market and they are not all equal. Resins affect cure time. The newer, performance wall paints, such as Benjamin Moore’s Advance, needs almost 20-30 days to FULLY cure for physical use in lab tests, but on a wall that does not matter - folks don’t walk on walls.

Furniture and cabinet finishers need a faster cure time. Furniture and cabinets may need to be stacked, packaged or used fairly immediately, so the resins are selected are based on cure time properties.

The second difference is the amount of filler used.

Both wall paints and furniture paints may use 100% Acrylic as the resin. Most interior house paints tend to be a combination of a binder, which is more expensive, (such as latex, acrylic, vinyl, vinyl acrylic, and others), a whole bunch of less expensive fillers such as calcium carbonate or talc, some pigment for color and water. The fillers in wall paint give it great coverage and allow the paint to be manufactured at a lower price point, but sacrifice durability and performance. Imagine wall paint as a can filled with 50% filler powder, some pigment colors, a little binder and then topped off with water. The higher end wall paints are a step up and improve this ratio but still tend to be less durable.

By comparison, a furniture paint may contain 30% filler powder, more binders and higher quality resins, pigments for color, and water. Chalk style furniture paints also have more filler powder than acrylic paints. That is why our Milk Paint is more durable than the average chalk style paint- the ratio of filler.

In summary, acrylic paints for furniture contain a higher ratio of resin to filler and superior resins.

High-quality acrylic resins give furniture paint the properties needed in the final finish: adhesion, hardness, flexibility (expansion and contraction with temperature changes in outdoor applications), good scrub resistance and superior color. These paints excel when it comes to flow, leveling and easy brushing. And these paints cure for use and recoating faster.

LIFE OF PRODUCT

Water-based products do not last forever, even when unopened. General Finishes products are best used within 1 year of the manufacture date listed on the bottom of the can. The life of the product may be extended to 2-3 years with proper care and storage.

SETTLING

Gravity can cause some solids to settle on the bottom of the can and slight separation on the top. This is normal. If working with older paint, use a paint mixing attachment on a drill. If the solids dissolve and clumps smooth out after mixing from the bottom, the product is in good condition for use.

STORAGE TIPS

See video tutorial: Tips on Storing Leftover Finishes 
Water-based finishes crystalize and form a skin due to evaporation when the air-tight seal on a can is broken at first use. The following best practices will increase the life of your product:

1. Pry open sealed lid(s) with a paint can opener by hooking under the lid's rolled edge. The use of a screwdriver can disfigure the rim and lid, impairing a complete seal.
2. Keep lid(s) closed while working. Pour what you will use into a bowl, paper cup, or plate, and close can lid as you work.
3. CLEAN the chime of the can(s) thoroughly with a paper towel before closing to create a complete seal. Paint in the chime can be minimized by using a pouring lid, such as Fitsall. Avoid wiping used brushes on the lid.
4. Pound the lid(s) in place using a rubber mallet to avoid distorting the chime or lid. Dents in the lid from direct contact with a hammer can impair a complete seal. Alternatively, place a flat piece of wood over can lid and firmly pound shut.
5. Store in moderate temperatures. Avoid temperatures below 50*F/10*C or above 80*F/26*C. Frozen and heat-damaged product cannot be revitalized. Temperature-controlled spaces, such as a basement, are ideal for storage. Do not store product in an attic, garage, in direct sunlight, or next to something warm like a water heater or furnace.
6. Store the can(s) upside down to create a liquid seal, minimize evaporation and reduce the chance of crystallization. Decant remaining product from the can before stirring.
7. Decant leftovers to a smaller container when the finish is almost used up. Alternative storage containers for water-based products are plastic FIFO bottles or glass bottles. Do not fill metal-lidded containers completely to prevent them from rusting.

The following water-based product mixtures can be stored:

1. Product combined with up to 15% General Finishes Extender or General Finishes Accelerator can be stored, with the exception of thinned General Finishes Water Based Wood Stain.
2. Mixtures involving colors & sheens within the same product line, such as:
   • High Performance Satin + High Performance Gloss
   • Snow White Milk Paint + Coastal Blue Milk Paint
   • Amber Dye Stain + Merlot Dye Stain

The following product mixtures should NOT be stored:

• Any water-based product with thinned tap water; water often contains bacteria that will adversely affect stored paint.
• Topcoat + Stain or Paint
• Milk Paint + Chalk Style Paint
• Water
• Water-Based Wood Stain + Dye Stain