What is Paint Bleeding?
Bleeding is the staining or seeping through of a soluble dye from the substrate through the top coat colour. Bleeding is normally observed as spots or patches of discoloration in the top coat, (often in red or yellow colours). Bleeding has several causes: 1. Dissolution in solvent of reapir materials of soluble pigments or dues from old paintwork. 2. Excessive peroxide due to reaction between polyester filler and pigments in repair materisls. Here a yellow-brown stain mark is often present. Blue and green colours are particular vulnerable this problem. 3. Residues from Bitumen or Tar. Along with the various causes, there are various ways to protect your paint against them: 1. A solvent test will help detect any soluble dye. 2. Use of recommended quantity of peroxide hardener when mixing polyester products and mixing the hardener in evenly and thoroughly. Do not allow coloured hardener to look streaky in the filler when applied. 3. Thoroughly remove any contamination before painting.
