Gentle folk

I live in Oregon and this time of the year it has either rained, is about to rain, or is presently raining. I need to varnish a strip rural mail box I did as a practic project. It is also a long over due present for a loved one. I am using or have Captains I believe and it says don't use if about to rain.

My hope is four halogin lights on the project will allow me to get away with using in my weather conditions. Without the lights the best I can hope for is about 50 degrees in my humble shop.

Please the more opinions, I know there is many on this subject, the better.

Thanks Tony