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what can i do to speed drying1/12/16
we spray 2k poly and are never running ahead of schedule where we can spray a given piece and let it hang out in the shop a week or so before installation.
right now, we keep finished pieces near the heater and have a household fan blowing air across them. i think this helps but don't know to what degree. when we need to wipe a piece down with paper to knock back nubs, bumps, etc. it will scratch (very fine, hard to find scratch marks) within 24 hours of being sprayed.
would an infrared light improve things? i know an air make-up unit for my spray booth would help significantly but it is well outside of our budget. i've looked at a couple infrared lights on stands that we could wheel into our enclosed booth after a piece has flashed off. any potential issues with getting some heat on a piece after it has flashed?
IR would DEFINITELY speed up your cure time dramatically.
air make-up will solve all your problems
Most 2K urethane manufacturers offer an accelerator that can be added to speed up drying and curing. Just using a drying oven will help some as well. If you want REALLY fast switch over to WB UV cured finishes.
thanks for the replies.
i'm not looking to replicate an almost instant cure with a heat air make up, but just help speed the curing process better than with the house fan we currently employ. i'd love to be able to wipe it with paper the next day without leaving any scratch marks. we currently need to wait 2-3 days to be able to achieve this.
most of the stuff we spray is pretty big (4'x8') so the sun spot wouldn't be well suited. i'm looking at some indoor/outdoor heaters that can bring the temperature up in the booth.
rick - i'm afraid of accelerating the drying process as we tend to retard our finishes to ensure a very nice, off-the-gun look and feel. this runs contrary to my post, but i like to introduce heat/something else to speed drying after the final coat has flashed.
How many posts have I read that people are spraying finish material with out a make up air unit? Who are all you people using for insurance?
Full enclosed automotive cross draft booth with chemical fire suppression. I also have a wet system (sprinklers) throughout my entire building. I'm fully insured and fully inspected.
Now back to my original question.
I wasn't trying to be rude or confrontational, I am just amazed anyone could get insurance with a spray booth and no make up air unit. Where does your supply air come from? Without supply air greater than your spray booth you are putting your building in a negative pressure, when this happens your heating and hot water tanks don't vent properly and could even fill the building with CO. I just hate to see anyone lose their business or get hurt.