spraying primer in direct sunlight

B

bmxpegan411

Hi Guys,

I am getting ready to hit a couple of sand-through spots on my roof (Honda Del Sol, very small panel off the car) with epoxy primer so that I can do a few more coats of 2k before finish sanding. It's about 73 degrees here and the panel is sitting outside in the sun so that it can get nice and warm before epoxy. My question is, is it OK to spray it outside in the sun, or should I get it out of the sun for a while before priming?

any suggestions are greatly appreciated!
 
If you have an infrared thermometer, you can see how hot surfaces get in direct sun. It's just not a good thing to shoot a coating onto a surface when most of the solvent will instantly fry out. it can make bubbles and affect adhesion.
 
Epoxy is one of the few products that does allow itself to be sprayed in the sun but the biggest issue is like Crash said, you don't want the metal temp over 100 degrees.
 
I avoid spraying in direct sun. But, is there any harm in taking the parts outside shortly after spraying to bake in the sun? If so, how long should I wait before sunning epoxy?
 
Obviously epoxy is a different animal then most other coatings, but generally if a coating has flashed, or "skinned over," and heat is applied rapidly, the result can be solvent pop. Generally, you need to either ramp up the heat before the material flashes, or wait a good while to let most of the solvent out of the material before heating. From what Barry says, the epoxy is tolerant of abuse in this regard, but I've just never tried it, having seen too much bad stuff happen from getting it wrong.
 
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