Scamp Rhonda said

A lot of purists aren't gonna like my answer here but it works for me.
1. I open the big door to the garage and the back door to cause a cross flow of air.
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2. I pick a day when the weather is going to cooperate. The wind has to be out of the north or northwest, or calm. Not a humid day. For instance, today wouldn't be a good day to spray for me because the wind is coming from the south and in through the big door. The only overspray I get from a HVLP gun is on the floor. When I used a Binks #7, suction feed gun I had overspray everywhere. Had to cover everything with plastic and hang plastic from the ceiling all around.
I've painted a lot of stuff over the years, boats, cars, locomotives, and things have changed quite a bit.

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Mineallmine said

I cover the seats and a few other items with plastic but don't really see any overspray. I also hang tarps around the car from the ceiling to floor to contain the painting area. I do not open the door but do wait for a day that the humidity is low. I also use an hvlp gun. Still somewhat new at painting but results have been pretty good thus far

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