渗色
Paint Defects 油漆缺陷
Causes 成因
- Soluble pigments or dyes from the old paintwork are dissolved in the solvent of the repair materials, and change in the shade at the surface
旧漆层中的可溶性色素或染料被维修材料中的溶剂溶解，导致表面颜色发生变化。
- Bleeding can also occur when excessive peroxide from a polyester filler reacts with the pigments in the repair materials causing a yellow-brown stain
当聚酯腻子中过量的过氧化物与维修材料中的颜料发生反应时，也会产生“渗色”现象，造成黄色或棕色污迹。
- Blue and green colours are particular vulnerable to this problem
蓝色和绿色的颜色对这种问题特别敏感。
- Residues from Bitumen or Tar if not cleaned off thoroughly
如果沥青或柏油残留物没有被彻底清洁，也可能导致渗色。
Prevention 预防
- Carry out a solvent test to check if soluble dye exists
进行溶剂测试以检查是否存在可溶性染料。
- Only use the recommended quantity of peroxide hardener when mixing polyester products and mix the hardener in evenly and thoroughly
在调配聚酯产品时，只使用推荐用量的过氧化物固化剂，并确保固化剂被均匀、彻底地混合。
- Never allow the coloured hardener to look streaky in the filler when applied
在使用腻子时，切勿让带颜色的固化剂在填料中呈现条纹状。
- Before painting ensure all contamination, especially bitumen and tar deposits, are thoroughly removed
在喷涂之前，确保所有污染物（特别是沥青和柏油残留物）都被彻底清除。
How to repair 如何修补
- To repair a bleed-through area, the whole area should be isolated with an appropriate sealer
要修复渗色区域，应使用适当的封闭剂将整个区域隔离开。
- If the bleed through is severe then the paint layers should be removed back to a sound substrate and then be refinished with the correct primer and top-coat process 如果渗色情况严重，则应将涂层打磨去除至稳定的底材，然后按正确的底漆和面漆工艺重新施工。