Herculiner is not very 'UV' stable.......it fades and get chaulky.....2 coats are required for exterior app's.

A quart will do an XJ's interior floor area, I would again suggest 2 coats.

All surfaces need to be scuffed, otherwise it wont adhere....

Herculiner is GREAT for the under carriage, interior and wheelwells......expect large little goblets in the finish.....they can be smoothed, but its a pain.

Rattle cans such as "Duplicolor" and "Plasticoat" brands are excellent for bumpers, sliders and things of that nature.......those are the only rattle can brands I'd ever suggest......