General Finishes White Undercoat is similar to General Finishes Sanding Sealer with the addition of white colorant to provide a primer undercoat for white/off-white wood finishes. The high solids facilitate a fast film build and sand easily. Use as a basecoat for pigmented acrylic finishes. It dries tack-free in 10-20 minutes. Particularly effective on MDF.
General Finishes White Undercoat should only be applied over raw wood and MDF as an undercoat for White Poly and light-colored paints. It acts as a physical barrier rather than a chemical barrier. For woods that exhibit tannin bleed-through, we recommend General Finishes Stain Blocker.
Enduro White Undercoat Application Steps
Stir General Finishes Enduro White Undercoat to reincorporate solids that have settled to the bottom of the can before and throughout the application process.
Thinas desired with distilled water; start with 5%, increase up to 10% by volume. Increase open time,if needed, with up to 5% by volume of General Finishes Extender, if allowed by local regulations. GF Extender will improve flow and leveling and increase open time, which is helpful in dry climates.
Apply 1-2 coats, depending on the substrate, the amount applied, and the application method. If you apply 1 light coat you can sand through, add another coat. If you apply 1 solid first coat and sand lightly, then you only need one.
Spray application: Before spraying, strain through a medium-mesh filter. Spray wet films at 3-5-mil thickness. Medium air cap. Fluid tip sizes: Compressed air: .040, HVLP: .072 or Airless: .011-.013. medium air cap. Verify tip sizes with your equipment supplier. See our general guide for spray tip sizes. Keep your gun at a 90° angle, 6-8" from the surface. On large, flat areas, use wet, even patterns 6-8" wide. For narrow surfaces, reduce the fan pattern to 2-3" wide to reduce overspray. Overlap each pass 25% to conceal lines. Wear a full filter (NIOSH/MSHA approved) respiratory & eye protection and work in a ventilated space. Read here for more information on spraying techniques.
Face frames on cabinets: Enduro professional products are engineered to be spray-only but can be applied successfully to cabinet face frames, edges or drawer fronts with a brush, pad or small cabinet specific 3/8" nap microfiber roller such as Whizz or AllPro brand. Larger areas may not level with hand application.
Dry 2+ hours between coats in ideal conditions: 70°F/20°C; 50-70% humidity. Inadequate dry time is one of the top reasons for product failure. You can tell if a water-based finish is dry if it forms a powder when lightly sanded with a fine-grade (220-320) foam sanding pad. If in doubt, wait longer. Increase dry time if:
Humidity is over 80%
3+ coats are applied
Thick coats are applied
Applying over an existing sealed finish
Layering General Finishes water- and oil-based products:
Water over oil: Let oil-based products dry 72+hr before applying water-based products
Oil over water: Let water-based products dry 24+hr before applying oil-based products
To accelerate dry time in humid conditions, add General Finishes Accelerator and work in a space with good ventilation and air movement. If you decide to re-coat before the recommended time, test dryness.
Finish sand between coats with a fine-grade (220-320) foam sanding pad to improve smoothness and adhesion.
Remove dust with a vacuum, compressed air, an oil-free tack cloth or a water-dampened rag.
Seal White Undercoat with topcoat to equal 4 total coats. If 1 coat of White Undercoat is applied, apply 3 coats topcoat over it. If 2 coats White Undercoat are applied, apply 2 coats topcoat. One coat White Undercoat sealed with 3 coats topcoat is recommended for durability. It's better to have more topcoat than undercoat.
Water-based finishes cure and harden for full use after 21 days in ideal conditions. Avoid placing heavy objects on surfaces that have not completely cured. Treat gently, and do not clean with commercial products during the curing period.
Warning: Do not use water-based products with Linseed Oils or Danish Oils.
Please be mindful of the manner in which water-based products are stored and how long they have been in storage. They not a forever product.
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 can. However, the life of the product may be extended with proper care and storage (see Storage Tips below).
Water-based products can last 3-5 years if the can is unopened, in good condition and stored in correct temperatures.
Product that is 3 years old will not look like product that is 6 months to 1 year old. You will see more stratification or separation as the product ages. Always stir thoroughlybefore using.
If your product hasa foul smell, it is contaminated and no longer in useable condition.
Clumps & 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 product stir with 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.
Inability to reincorporate large, chunky lumps after stirring for several minutes is an indication that the product has frozen and can no longer be used.
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:
Pry open sealed lids 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.
Keep lid closed while working. Pour what you will use into a bowl, paper cup, or plate, and close can lid as you work.
Clean the chime of the can thoroughly with a paper towel before closing to create a complete seal. Product falling into the chime can be minimized by using a pouring lid, such as Fitsall. Avoid wiping used brushes on the lid.
Pound the lid 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.
Store in moderate temperatures. Avoid temperatures below 50°F/10°C or above 100°F/26°C. Keep from freezing. 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.
Store can upside down to create a liquid seal, minimize evaporation and reduce the chance of crystallization. Decant remaining product from the can before stirring.
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:
You have just finished applying a fine furniture finish. Treat gently until the paint or topcoat have fully cured. Allow 21 days for a water-based finish to cure and 30 days for an oil-based finish to cure before cleaning.
Regular Cleaning and Maintenance
Remove dust with a water-dampened cloth. Dust can build up over time and may scratch or dull finishes if not removed regularly.
Remove fingerprints, cooking fumes and smoking residue with mild soap and water. These contaminants will not harm the finish, but they accumulate on surfaces and dull the original luster.
As with all fine furniture finishes, avoid using furniture polish, cleaners or dusting sprays that contain silicone, alcohol, ammonia and anything acidic. Exception: We have successfully cleaned with Clorox wipes.
Clean up water, alcohol and food spills in a timely manner and use placemats & coasters to protect the finish.
Future finishes or touch-ups may not adhere properly or perform as desired over a contaminated surface. Some contaminants, such as silicone, seep through finish into the wood and often cannot be removed.
Avoid excessive exposure to direct sunlight, high temperatures or high humidity. These can damage furniture and finishes.
Do not use water-based products with Linseed Oils or Danish Oils.
General Finishes products must be tested to your complete satisfaction before using. General Finishes will not be responsible for color satisfaction, misapplication, nor compatibility with other manufacturers' products. General Finishes will be responsible only for the cost of our products, and not for costs such as labor, damage or project replacement.
Contamination and Compatibility
Our finishes are engineered as a system and are compatible with each other. General Finishes cannot guarantee an ideal refinish when applying our products on top of or combined with another company's products or over surfaces that have been in contact with waxes, polishes or sprays containing contaminants such as silicone. Test for adherence and aesthetics before beginning.
If you scrape, sand, or remove old paint, you may release lead dust. LEAD IS TOXIC. EXPOSURE TO LEAD DUST CAN CAUSE SERIOUS ILLNESS, SUCH AS BRAIN DAMAGE, ESPECIALLY IN CHILDREN. PREGNANT WOMEN SHOULD ALSO AVOID EXPOSURE. Wear a NIOSH-approved respirator to control lead exposure. Clean up carefully with a HEPA vacuum and a wet mop. Before you start, find out how to protect yourself and your family by contacting the National Lead Information Hotline at 1-800-424-LEAD or log onto www.epa.gov/lead.
Seek immediate medical attention if symptoms occur due to the following. EYE CONTACT: Remove any contact lenses. Flush eyes with water for 20+ minutes while lifting upper and lower eyelids. SKIN CONTACT: Wash thoroughly after handling. INHALATION: Move to fresh air and loosen clothing. If not breathing, if breathing is irregular or if respiratory arrest occurs, provide artificial respiration or oxygen by trained personnel. INGESTION: Call physician immediately. Wash out mouth with water. Do not induce vomiting unless directed to do so by medical personnel. Never give anything by mouth to an unconscious person.
This product contains a chemical known to the State Of California to cause cancer and birth defects. Do not swallow; first aid: drink water to dilute product. May cause eye or skin irritation; first aid: flush eyes thoroughly with water.
Keep out of reach of children. Avoid contact with eyes. Keep container tightly closed when not in use. Wash thoroughly after handling.
Interior or Exterior
1 - 2 coats
Usable over existing finishes
Spray Tip Sizes
Dry Time - Touch
Dry Time - Recoat
Dry Time - Light Use
Dry Time - Cure
Gallons, 5 Gallon pails, 55 Gallon drums
450 sq. ft/gal
<95 g/L. Varies by color. See color-specific SDS for exact number.