Masking off underbody

[chargerguy111]

My underbody is already painted.Anyone have any ideas on an easy way to mask it off while I am working on the body itself?

[bill440rt]

How long has it been painted? If it's fully cured, try using a sprayable masking film. You spray it on with a regular spray gun. When you're done doing your dirty work, simply hose it off. It turns to foam, like soap suds. Couldn't be easier.

If you want to double the protection, you can also line the outer perimeter of the underside of the car with 3/4 masking tape. Then, using 2 inch tape, cover the underside with wide 36 inch masking paper. I was able to cover mine with about 3 strips of 36 inch wide paper.
All this stuff should be available at your local auto body supply store.