Epoxy Flash Time

S

strum456

Oldtimer
Hypothetically speaking, what adverse affects could there be to rushing the flash time of epoxy if it is not going to be top coated?

I've been doing some parts to a front loader, which are finished in black epoxy. It sure would be nice to hammer on three coats in a half hours time and call it done.
 
'68 Coronet R/T said:
Tech Manual says 30 minutes between coats at 70 degrees.
You could be done in an hour and 45 minutes including clean up.
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Tech manual says two wet coats or for restorations, spray a coat and let flash 30 min before next coat. I’ve sprayed two coats at a time before but never three at once that’s being proposed. I’d be inclined to wait 30 min before the third coat.

When I was spraying the big roof of that camper I just hammered on two coats at the same time, basically doubling back over every pass, at the B man’s recommendation.
 
Lizer said:
Tech manual says two wet coats or for restorations, spray a coat and let flash 30 min before next coat. I’ve sprayed two coats at a time before but never three at once that’s being proposed. I’d be inclined to wait 30 min before the third coat.

When I was spraying the big roof of that camper I just hammered on two coats at the same time, basically doubling back over every pass, at the B man’s recommendation.
Click to expand...
It also speaks of applying a 3rd coat.

"Spray two wet coats for normal applications. For special projects such as restorations, spray one coat and let it flash 30 minutes or longer at 70 degrees or higher. Then spray a second coat for maximum corrosion protection. For frames we recommend three coats to make sure you do not have any thin spots as frames tend to be tougher to spray.
You do not need to top-coat our epoxy on frames, wheel wells, firewalls, or suspension components."
 
strum456 said:
Hypothetically speaking, what adverse affects could there be to rushing the flash time of epoxy if it is not going to be top coated?

I've been doing some parts to a front loader, which are finished in black epoxy. It sure would be nice to hammer on three coats in a half hours time and call it done.
Click to expand...
Rushing the flash time will cause the overall cure time to be longer, you can also get some fisheye looking pigment separation if the solvents haven't all left the coat before. Slow down, it will be faster.
 
A longer cure time makes sense. In many cases parts of a machine may have weeks to lay around and cure before assembly, so cure time isn't usually a big concern. I'm wondering if there would be any reduction in the long-term durability.
 
strum456 said:
A longer cure time makes sense. In many cases parts of a machine may have weeks to lay around and cure before assembly, so cure time isn't usually a big concern. I'm wondering if there would be any reduction in the long-term durability.
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I think the durability comes from the induction time. The longer the better. For sure better UV protection with black.
 
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