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Overspray shield

#1
I need to cover the underside of my car before priming the body. Masking is taking way too long. What liquid spray on coating do you guys use that washes off after the job is done?
 
#2
I'm using the 3m product, seems to work as designed but I still strung plastic under the car just incase. I've sprayed the underside, wheelwellsand everything under the hood with about a 1/3 of a gallon using a 1.8 tip on a 3M gun and cup system.
 
#4
I remember the guy that used to paint our race cars talking about a job he did one time. He said he had a guy that wanted him to paint a vehicle, I dont remember alot of the particulars, but the guy insisted it would be masked and ready to spray for him when he got there. So he shows up to paint and he couldnt believe it but the guy smeared Vaseline all over a bunch of stuff that was to be masked. We laughed for several minutes at the thought of the guy trying to clean all that up.
 

Barry

Paint Fanatic
Staff member
#7
Thanks. The 3m stuff looks expensive and found a local jobber that has slime, so I'll give that a go.
They all pretty much the same, highly concentrated soap with a PV alcohol to dry it.
Most are made to dry but the last I knew 3m also had one that stayed wet.
I've used it to coat assembled frames and engines before I put the body on the car if painting body on the frame.

Do not run the engine if you have the coating on it and second do not put in the sun.
 
#8
When using the spray masking be very careful and mindful of the overspray. If it lands on the area your painting that could be bad. Had a "know-it-all" at work once use it in place of car cover plastic and when he painted the doors he repaired the paint came off in spots when he was putting it back together.
 

Barry

Paint Fanatic
Staff member
#10
When using the spray masking be very careful and mindful of the overspray. If it lands on the area your painting that could be bad. Had a "know-it-all" at work once use it in place of car cover plastic and when he painted the doors he repaired the paint came off in spots when he was putting it back together.

Years ago use to get calls where car was out in sun and part of car was covered with a spray mask that would not rinse off.
They tried wax and grease remover or lacquer thinner and some tried urethane reducer, sorry none will work.
Best way is in shade and set a fan sprinkler hitting the car and just leave it.
 

Barry

Paint Fanatic
Staff member
#14
One thing you want to avoid is direct spray to the mask product, so first defense is an 18" of masking paper over it.
All i ever did was just wet with a hose when done let set a few minutes and wash the soap off, I never have used high pressure just water out of hose.
 
#15
I've used it since it was developed. In the old days there was a commercial brand soap we used. Took a couple days to set up. There is no way to mask a complete car . Race cars were the worst .
5 coats of primer then colors and clear create a ton of overspray .
 
#16
I have never used it but don't see how you keep from getting it all over everything. There must be a pretty involved proceedure to apply it.

John
 
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