When applying Brushable White Enamel over raw wood, apply 2 coats of Stain Blocker FIRST. Watch product overview video here.
Causes of bleed-through:
- Raw Wood Tannin Bleed-Through is unpredictable; yellowing can appear immediately or months later with seasonal temperature changes. Oak, pine, mahogany, and Douglas fir are particularly prone to bleed-through.
- Knots in Wood tend to bleed and are dense, making paint adhesion a challenge. Stain Blocker may improve adhesion and prevent bleed-through.
- Existing Finishes Bleed-Through may be caused by wood tannins, previous stains or aniline dyes, surface contamination, and incompatibility between brands.
- ALWAYS apply 2 coats General Finishes Stain Blocker before applying Brushable White Enamel over an existing finish for adhesion and to prevent bleed-through.
Non-Wood Surfaces may be able to accept paint if primed first. Primer may improve adhesion over laminate and prevent bleed-through from MDF. Metal requires a primer made specifically for metal.
NOTE: Do not tint or use General Finishes Stain Blocker on projects that will be stored outdoors.
Priming Non-Wood Surfaces
Always test for adhesion on a hidden area of your project before getting started.
Metal: Brushable White Enamel is engineered for wood surfaces, but may adhere to metal, such as aluminum or steel, if a metal primer is applied first.
- Clean surface well.
- Apply primer.
- Dry 48-72 hours before painting.
Laminate: Brushable White Enamel MAY adhere to laminate with a bonding primer; however, we cannot guarantee it. You may increase your chances of success by abrading the surface.
- Prep: Deep clean, dry thoroughly, sand with 150- then 180-grit sandpaper, and wipe off dust.
- Prime: Apply bonding primer, dry 12+ hours before painting.
MDF: Brushable White Enamel can be applied directly to MDF, but the MDF may cast a brown color if not primed first. Two base coats of white-pigmented shellac-based stain-blocking primer, or Stain Blocker, may prevent bleed-through. Alternatively, one base coat of General Finishes Seagull Gray Milk Paint may block brown tone caused by MDF.
MDF is not as absorbent as natural wood. Let each coat of primer and paint dry at least 48 hours before recoating.
Although Stain Blocker is engineered to prevent the most persistent bleed-through when 2 coats are applied, General Finishes cannot guarantee prevention of bleed-through or yellowing on every project. Unknown factors and assiduous bleed-through can impact results. Stain Blocker is the strongest option we are aware of at this time and has performed extremely well in our tests.