Knot Staining issue on colored film

Wood resin bleed on paint film (Knot Staining) is the natural bleeding of wood resin on the surface of wood, even after applying wood stain or polyurethane. The resin can still seep through to the surface, causing stains on the paint film, blotchiness, and stickiness as well.

Causes

• The oil and resin from the wood bleed out to the surface of the wood, especially in pine and softwoods.
• Not using, or using a primer that cannot prevent moisture and wood resin.

Solutions

1. Prepare the surface

by sanding the wood down to the bare wood with sandpaper, grit 80-100, first or using a sander, then clean the wood resin withBeger Thinner M-77. After that, clean the surface by wiping off dust or other stains.

2.Apply primer

If it is softwood, such as rubberwood, jujube wood, or pygeum wood, it is recommended to applyBeger Wood Preservative B-6900first, one coat, and let it dry for 1-2 hours.

• For woodwork that does not require showing the wood grain, apply a primer to prevent wood resinBeger Aluminum Wood Primer BD-1601orBD-977, one to two coats, and let it dry completely before applying opaque wood paint, such asBeger ColorShieldorBegerShield Diamond Super Gloss Enamel
• for woodwork that wants to showcase the wood grain After wiping with thinner and applying wood preservative, you can apply wood stain or wood floor stain directly.

In the case of wood flooring or parquet flooring, after sanding the wood surface, apply a primer to prevent resin bleedBeger Wood Sealer B-20001-2 coats, leaving it to dry completely. Check for any resin seeping through the film layer. If none, apply another coat until the grain is filled or cover with B-2400 grain-filling primer for a smooth finish before applying the desired polyurethane.

3. Apply the topcoat correctly on the woodwork.

In the case of vertical woodwork, such as walls or trellises, applyBeger Wood Stain

For wood flooring,

• wood floor stain can choose to use productsBeger Deck Stain Beger Natural Deck orBeger Super Deckby mixing thinnerBeger M-1199in a ratio of 3:1, then apply 3 coats, allowing to dry for 3-5 hours between each coat.
• Wood polyurethane after applying primer B-2000, you can choose to use products Beger B-5000 Polyurethane 2K  Beger Polyurethane Supreme 2KorPolyurethane 1K SupremeApply according to the steps in the user manual

Problem prevention

1. For rubber wood or softwood, always wipe with M-77 thinner first
2. If it is a polyurethane flooring project, it is recommended to apply Beger Wood Sealer B-2000 as a primer against rubber wood before proceeding
3. You should choose thewood paintproduct correctly and strictly follow the usage steps in the manual

Tips & Tricks

• In the case of softwood, after surface preparation, apply wood preservative Beger B-6900 as a primer against mold, termites, and wood-eating insects as well

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