How to Restore a Car’s Paint Job : Using Booth Pressure when Painting a Car


Hi, I’m Doug. I work with twenty great guys
in St. Louis at Doug Jenkins Custom Hot Rods and we’re going to do some work for you today
on Expert Village. There’s a mess of cool ways you can adjust the operation of the paint
booth. The one thing I noticed here, we were having trouble getting the door to shut after
our last operation. This is called a magnahelic. It meaures the pressure inside the paint booth.
You want a net positive pressure in the paint booth. If you have a negative pressure then
it’s going to be sucking air from around the corners of the doors. So, essentially the
paint booth needs to be slightly inflated while you’re painting. This adjustment here,
I turn it to the left and that adusts a damper that keeps the pressure exactly where you
want it. I’ll head towards the low end of the paint zone. The reason that it gets pressure
built up is the filters get dirty with the paint you’re spraying. So, if you have too
much paint in them you have to back off on this damper and that’s specifically the damper’s
job is so you can keep adjusting it and keep exactly the right amount of positive pressure
in there. The guage up higher here, this is how we adjust the temperature. So, right now,
we have the booth adjusted for eight-eight degrees and it’s currently eighty-eight degrees
in there. It you take and paint a car anything below seventy degrees it won’t stick. The
paint won’t work.