Resealing Roof Joints and Penetrations

I would invest in some 4" Eternabond - wipe the old surface clean with laquer thinner, apply the tape and roll it with a hard roller as it's pressure sensitive.

You won't need to worry about it again for at least 5 years

I have just over some spots on mine. I would think if there is a big build-up...just cut away a little with a razor blade and add the Dicor. It is great stuff!

You can do either. If you took it to a dealer, they would just apply the new over the old.

I agree with the poster above about the Eternabond tape. I, as many others have, used it on every seam and penetration on my roof quite a few years ago, shortly after I got my new trailer, and have never had any kind of leak. It is a bit more work than just squirting on a bead of self leveling caulk but it only needs to be done once.
Barney

I have an old Holiday Rambler that does not move. I use the white elastomeric stuff they sell at hardwares for about $20/gallon, just paint it on thick(I clean surface with bleach and water due to being under trees). I coat it about every 5 years and no leaks. How much does the Eternabond stuff cost?

All,

Keep in mind Eternabond might be a great option for certain seams, but I'd never use it on a vent cover or anything like that that I might replace some day (antenna, sewer vent, etc) getting that stuff off would be a real pain.

Dicor for me, thanks.

I am hoping either rvroof.com or Rhino Linings gets a spray booth affiliate in my neck of the woods. A polyurethane epoxy elastomeric coating (big words for stuff that will stay flexible and stretch as the RV bounces down the road and as weather changes) sprayed on from a two part mix would be the ideal solution, as it would only need to be applied once, then perhaps reapplied as one replaces things on the roof, or if there are punctures (say by tree branches.) Since it dries to effectively one piece, no Dicor or Eternabond is ever needed, and since it is painted a bit down from the top, water won't be going in any roof seams.

FI, I see most users just apply Dicor over the old stuff. It doesn't make sense to me as the sealant that is covered is still deteriorating and cracking. If you go the sealant route, I would remove as much of the old stuff as possible.

I used Eternabond on my roof and was sceptical on the properties of the tape (mainly from the almost 100% positive reviews). After applying the tape and doing a blower test on the TT, I recommend Eternabond, heartily. Areas that were sealed with just sealant still had tiny pinhole leaks but everything with Eternabond was leak-free.