Outside speaker replacement sealing/caulking

[qdude79]

Replacing the exterior Furrion speakers on my '17 JayFlight 245RLSW with the uneven/corrugated siding.

When pulling the old speakers, it appears to have some putty, almost like plumbers caulking to seal them.

My question: what do I re-seal the new speakers with? There are some large gaps against the uneven surface that need to be filled and I want to make sure I'm using the right stuff the first time. Anyone?

[ATX512]

My vote is DC 795 is a silicone based product, not very agreeable to painting, but not caustic to metals like polyurethane. The engineers I work with find its most agreeable when sealing dissimilar materials.

[ATX512]

*like a polyurethane. RTV (room temperature vulcanizing) sealant is corrosive to metals.
Just to clarify

[MichaelO]

Butyl tape is most likely what you’re looking for.

https://www.campingworld.com/butyl-t...%27-39160.html

[qdude79]

I hadn't seen a close up of the butyl tape, I think that's what's on there. Though I appreciate the DC 795 suggestion. Thanks, everyone!