humidity and enamel

[rsmall]

I'm using Nason urethane enamel for my car and I need to know the highest humidity in which I can spray. I'm on the Texas gulf coast and I've had my garage paint booth ready for two weeks, but its been raining for three weeks.
80%+ humidity is pretty normal this time of year even without the rain.

[56Ford]

You should be ok... I'm often painting in high humidity and I have no trouble...
Dry times may be a little longer tho.

[SHOWCAR FINISH]

That's really high humidity. I wonder if blushing would be a problem with that kind of humidity. I'd paint early if I wasn't sure. These guys would know way better than I would though.

[Len]

I'm using Nason urethane enamel for my car and I need to know the highest humidity in which I can spray. I'm on the Texas gulf coast and I've had my garage paint booth ready for two weeks, but its been raining for three weeks.
80%+ humidity is pretty normal this time of year even without the rain.

The "humidity" is not the problem in itself as much as it is moisture that can collect on the surface of ANY material or paint when the surface is cooler than the surrounding moist air. This means that if a liquid is sprayed onto the surface and the solvent in that liquid evaporates cooling the surface then moisture could condense causing problems.

Lacquer was always a problem on warm humid days because the thinners could evaporate quickly, cool the surface and the resulting moisture would cause "blushing" of the paint. Enamel and urethane don't usually have the amount or type of solvent that evaporates quickly so they don't cool the surface and don't result in moisture on the surface. However if you over-reduce with fast reducer it's possible to cause condensation that could cause problems but it's not as likely as faster drying solvent.

Use reducer that is designed to be sprayed at your ambient temperature and you should have no problem.

[88GT]

Im in south central TX. 80% is average. Paint away
I used to worry about humidity alot more, but the more Len says about not worrying about it, the less I worry about it

[rsmall]

Thanks, guys. Sounds like I can shoot it tomorrow (only a 30% chance of rain). Besides, the wife wants the garage back.