Use the broom to clean your roof before applying tar roofing.
Using roofing tar for undercoating.
The coating itself is a tar like substance that sticks to the undercarriage components and acts as a barrier to resist salt moisture oxygen and other items that lead to corrosion.
Problem with roofing tar is the metal continues to rust.
Undercoating spray can be purchased as a diy product but it s tricky to apply so it s best to use this method at the dealership on a new vehicle.
Roofing tar takes a lot of heat to put on slops on with a mop gets soft in the summer and can crack in the winter.
Probably not a good idea.
The stuff is fine for the top of a flat roof but probably terrible for the bottom of a car.
Then the roofing tar will fall out.
Using small amounts at a time apply the roofing tar with your roller in short and smooth strokes.
It s a true temp fix as eventually the entire metal under the patch will rust away.
When there is no debris left you are ready to apply tar to the roof.
I ve got photos attached of my gold award winning undercarriage on our 69 mach1.
You can use a black roofing tar cement asphalt in a gallon container.
Rubber coat 57 roof tar.
You mix the black roofing cement asphalt with mineral spirits to get a brushable consistency and just brush around all the areas on the undercarriage that ford originally brushed it on.
The sunlight will thin the tar and make it easier to apply.
And can you imagine how hard it would be to take off in a few years.