STAINING/PLASTIC BLEED THROUGH

Discolored, Bleed-Back

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

CAUSE

• Using too much or too little hardener in the putty/filler
  
• Insufficient mixing of putty/filler components.
  
• Applying a surfacer, sealer and/or topcoat before putty/filler has thoroughly cured.
  
• Applying undercoats and/or topcoats excessively wet.
  
• Clearcoating a white or light color without using a stain-free body filler.

REPAIR

Allow topcoat to thoroughly cure.

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

PREVENTION

• Use correct amount of body filler hardener.
  
• Mix components thoroughly.
  
• Allow putty/filler to cure thoroughly before topcoating.
  
• Apply undercoats and/or topcoats in medium-wet to wet coats; always allowing proper flash time between coats.
  
• Use non-staining body filler, especially when clearcoating light colors.
  
• 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.

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