Asphalt shingle leaks can be caused by a variety of things including folded shingles nail holes and flashing issues around corners chimneys or vents.
Using roofing tar for undercoating.
Rubberized undercoating is safe to use on quarter panels and wheel wells and dries with a soft rubbery finish.
Roofing tar will also protect your roof from wind and from snow and water which can collect on a flat roof.
Also tar can dry and separate from metal and trap moisture causing the rot common on vehicles over 10 years old that had been treated with ziebart or other tar like products.
Roofing tar is often used for tar and gravel roofs or to fix leaks on a roof.
Rubber coat 57 roof tar.
Pros and cons of roofing tar.
Roofing tar is a good choice for a flat roof as this kind of material is highly resistant to the ultraviolet rays from the sun.
I would not apply anything i may have to remove at some point.
These products are some sort of oil.
Use of a sealant to stop asphalt shingle leaks.
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.