baking clear

J

jeremyb

According to the tech sheets, says not to back UC at no higher than 120 for no more than 20 minutes. What if after the clear is shot and booth is off and set over night, i come in the next morning and flip bake on and run about 30-45 minutes at 130-140 degrees? Stays 65-70 degrees in shop during working hours. Pretty dang cold right now and nothing but rain next few days. Will be an allover -4 coats.
 
jeremy, i do that all the time. i dont really know what i get the temp to but i dont think its quite as hot a 140,..... 120 maybe.
 
why cant it be baked at higher then 120? is it because its a polyurethane clear?
 
It has to do with they type of resin and solvent blend.
First 4 hours should always be a low temp bake, after that good to go.
 
Ahhh ok. What would happen to it anyway? The clear that gets used at our shop doesn't compare to SPI's but if we do bake the painter takes it right up to 145.
 
I know i have gotten it really hot alot of times, usually on small parts when i put a lamp on it. Nothing has ever happened so i have no real answer.
 
99 time out of a 100, nothing will happen but the potential is there for slight solvent pop and it does happen to new shops that used the clear and bake at 140-145 for 45-60 minutes.
The call is usually it died back but it was a real fine pop that caused it to look like it died back.

I should add older style resins and low solids, baking is not an issue at any temp.
 
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A couple of heat cycles after an overnight air dry definately helps get it ready for buffing. JC needs to patent his electric blanket idea and make a full car sized version:D-I haven't tried that but I bet it works. I know I've had 140+ temps with lamps and never had a problem, we all know what the summer sun can get a dark color up to and that also never seems to be a problem.
 
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