Consider leaving your container of roofing tar in direct sunlight for about an hour.
Using roofing tar for undercoating.
Problem with roofing tar is the metal continues to rust.
The sunlight will thin the tar and make it easier to apply.
Then the roofing tar will fall out.
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.
It s a true temp fix as eventually the entire metal under the patch will rust away.
And can you imagine how hard it would be to take off in a few years.
Use the broom to clean your roof before applying tar roofing.
Rubber coat 57 roof tar.
Use por 15 and fiberglass for a permanent fix.
Start in the corner furthest from your ladder.
When there is no debris left you are ready to apply tar to the roof.
Using small amounts at a time apply the roofing tar with your roller in short and smooth strokes.
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.
I ve got photos attached of my gold award winning undercarriage on our 69 mach1.