Wanda Base Coat Blushing

El Toro

Member
Wonder if anyone has a blushing ( and if that is what it is ) effect using black Wanda base coat. I use Wanda on about 50 % of my collision repairs and yesterday did a spot repair and sure enough looks like blushing with a small white fog mist in the color. Using SPI med reducer and temps are 70 and lower humidity. I stopped and rebased it and took a heat gun over the repair and is ok.Also sprayed over a clean reducer can and same problem. Maybe the base has a higher water content???? Oh this is solvent base. Happens a lot Thanks for help
 
Simply switching to 885 will most likely cure your problems. Sometimes I use a 50/50 blend of 870 and 885 in cooler temps. IMO 870 is a bit fast for basecoat in a lot of instances.
 
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This thread reminded me of a blushing issue I had decades ago at my motorcycle shop, not with base, but with Dupont clear lacquer.

I had countless hours invested in murals, gold leaf and striping on a full custom street/show bike, all done in lacquers, and began building up clear late one night, as always with clear, using the slowest thinner (I believe it was 90). Looked great when I left the booth, and I drove home in a pea soup fog. The next morning the clear had blushed. I freaked, fearing I'd have to strip the entire job and begin again. I'd developed a relationship with the Dupont chemist in charge of their Imron division, so called him and he said to just hit it again with more clear when humidity was down. I did and the blushing disappeared....The additional lacquer had melted into the blushed layers. I continued to build with many thin cotes of lacquer and all was well.

After this close call I paid attention to humidity in the air, not wishing to repeat the experience. I used lacquer for my "show" bikes, but had gone to Imron clear for most of the street bikes due to it's durability and resistance to gas spills, etc. I now knew the solution when shooting lacquer, but was concerned that if the blushing happened to Imron clear, shooting another cote wouldn't save the project. Fortunately, I never had need to find out...

My question..., Is blushing due to temps/humidity ever an issue with modern clears?

Thanks,

Lance
 
blushing is simply condensation forming in the base. the water content isnt in the base but its forming in the base because its getting too cold from flashing too fast and bringing the basecoat below the dew point. slow it all down and dont spray heavy
Really like the explanations that are frequently given! Helps to know why.
 
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