STAINING/PLASTIC BLEED-THROUGH (Discoloration)

A yellow-brown discoloration appears in the topcoat over areas repaired with polyester body filler or glazing putty.

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CAUSE

(A) Using too much or too little hardener in the putty/filler

(B) Insufficient mixing of putty/filler components.

(C) Applying a surfacer, sealer and/or topcoat before putty/filler has thoroughly cured.

(D) Applying undercoats and/or topcoats excessively wet.

(E) Clearcoating a white or light color without using a stain-free body filler.




REPAIR

(1) Allow topcoat to thoroughly cure.

(2) Sand affected area, isolate with two component undercoats and refinish.




PREVENTION

(A) Use correct amount of body filler hardener.

(B) Mix components thoroughly.

(C) Allow putty/filler to cure thoroughly before topcoating.

(D) Apply undercoats and/or topcoats in medium-wet to wet coats; always allowing proper flash time between coats.

(E) Use non-staining body filler, especially when clearcoating light colors.

(F) Isolate suspected staining filler by applying a two-component surfacer and sealer.* Allow to cure, following product recommendations, then apply desired topcoat.

* Two component acrylic urethane primer surfacer and acrylic urethane sealer may be used to top a majority of body filler staining problems. Both are required and must be allowed to fully cure for maximum stain resistance. However, for 100% assurance against body filler staining, use a non-staining body filler according to manufacturer's recommendations.