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The temperature has dropped to 55' and our tech has warned to not spray below 65'. We don't have a heated booth and wondering what others in this situation are doing. Have thought about spraying and than bring in an infra red heater to help dry and cure.
Bring the air in from inside the building.
You could try warming whatever you are spraying. Wrap an electric heater around the container and let it heat up for 15 minutes before spraying. I use a Warming Wrap insulated heating cuff. It has Velcro and comes in quart and gallon sizes.
The viscosity will drop somewhat.
The wood has to be 65 degrees as well as the air temp. Temporarily heating the booth will still not provide the best result. Add another furnace to the shop.
Try this first.
In addition to using the Warming Wrap, you could keep what you are spraying outside of the spray room where it is warm until just before it is sprayed. Then immediately take it out of the spray room back into the warm room. This should keep the exposure to a cold drying environment to a minimum.
If you're spraying a catalyzed finish like Conversion Varnish, you really need the ambient temp in the curing environment to be close to 65F.
While heating the wood and the fluid finish will definitely help, the wood will begin cooling quite rapidly once it starts evaporating finish.
If you read the spec sheets of most catalyzed finishes, the finish needs to cure at 65 degrees for "X" number of hours to reach proper hardness/durability.
I've never found those guidelines to be a hard-set rule, we tend to fudge them a little on the "cooler" side, but we can't get away with much.
We are fortunate enough to have a gas furnace that supplies a decent Make-up air, and we place our curing doors in an area that only gets gentle air-flow (ie, not directly in the spray booth air flow).
The air from the curing racks still exhausts through the spray booth, but it's not direct flow. That helps a lot.
Also install a variable speed fan in the booth. You can slow it down for the outgassing and not send so much heat outside.
Good point Rich, those VS fans are excellent. Unfortunately most shops have discovered "Variably Clogged Filters" to the same effect lol.