Maybe I've been around too long, but if I understand your post you intend to use truck bedliner material to paint the exterior of your RAV4 . . .if so, why do that? Also the existing exterior of your RAV4 looks to be in great condition as is.
It’s been keyed and scratched up from brush and limbs while off roading. Several advantages to it, no more scratches, no more waxing 4 times a year, makes the ride quieter because it acts as a sound buffer, and l like the way it looks. In case you’re curious it adds 45-60 pounds to a full-size truck, so probably 30-45 on the little RaV4. I’m researching the type, but will probably go with raptor liner. Here’s an. Example