[Hucky]

RTV is like silicone, its just labled RTV used on Gaskets like on valve covers, Oil pan covers etc....

Whatever you use, do a clean job and tape off the areas you dont want a mess on, have some denatured alcohol handy to clean any excess mess up and alot of rags, use Blue tape to mask off, instead of white mask tape, its easier to remove.

You mention Roofing silicon, If your thinking Henrys 77 roofing cement, dont use it! It will heat up in the sun and start running on you.

3M tape is two sided but make sure you get the automotive 3m two sided tape, its alot stickier than other stuff and is usually really thin and black colored, Your H2 logos on the doors are put on with this stuff.

Shoe Goo works too, RTV Sealant works, Silicon clear works,