sealing the roof around seams

[Rzrrider63]

I have a 2019 ATC toyhauler and need to seal all around the perimeter of the roof. What is recommended for doing this, as I heard silicone will not stick to the aluminum. Any advice on the proper product to get appreciated. I have a small leak in the bedside closet.

[Merlin]

Silicone is not your friend for that. If you mean the horizontal surface on top, I would use Dicor self-leveling caulk. If you mean the sides on a vertical surface, Dicor regular caulk is a good choice. Either way, the success will depend on how well you clean the area. You can't clean too much! A final scrubbing with alcohol will help get soap/grease/residue off before caulking.

[GoElectric]

Merlin's advice above is excellent. I went with EternaBond Tape to hopefully be once and done.  You will still need to thoroughly clean before applying and a weighted roller to apply it. Wow, is it sticky, so be careful! It is suppose to last 18-35 years exposed to the elements. I put mine on the perimeter, around AC, vents, etc 3 years ago and still looks new. If I remember correctly, it was considerably more pricey than Dicor.

[Merlin]

I second the EternaBond tape, especially for large cracks or anywhere caulk is missing completely. It's good stuff.

[MikeT]

Can you tape right over the old (cleaned) caulk?  It looks quite difficult to remove.

[Merlin]

Sure. If the old sealant is clean and sticking well, I've just taped/caulked over it. I have tried to not end up with a place where water can pool.