I finally found the source of a leak we have been experiencing. There is rain entering a window from somewhere along the top and it comes in and drains out the bottom and onto the counter. I know it is coming in the top of the window seam because I put a dry rag along the top edge one day while it was raining out and leaking inside. That stopped the leak. So, I know where to apply the sealant, but I am unsure of what brand or type of sealant I should use on it. I thought a regular silicone sealant would work, but thought that maybe there is a product specifically made for TT's and MH's. If any one has any advice or suggestions, I am anxious to hear them.Thanks.

Don't use silicone on an RV exterior, it will degrade and eventually fail. Any of the better urethane or polymer sealants work well. A lot of folks on this Forum use Dicor or Proflex RV. I use Geocel Tripolmer construction adhesive (a cousin of Proflex RV) and it is holding up well.

Ditto the Dicor (non-sag) or Proflex. If you use silicone it'll eventually peel and the residue it leaves will prevent anything else from sticking.

Thanks guys. I figured there was some special sealant made specificially for RV's and similar outdoor projects. But, then, the follow on question is: Where can you find this stuff? Will it be available at a Home Depot or Menards or would I have to look to an RV dealer and supply outfit?

Exterior sealants are available from Home Depot and such. Look for a major brand urethane or polymer based sealant for best results. Also thoroughly clean the area where you apply the sealant.

If this is a clamp of flush window? The butyl seal on clamp windows csn fail. Before wasting time slathering sealant all over the window, take it out, clean everything throroughly, go buy a roll of butyl putty tape. Apply all around the window, reinstal. Clean excess squeeze out, now, apply a small bead of Dicor around the top and sides of the window. Now you have a professional, permanent fix.

Water proof sealant | Good Sam Community

17 Replies

esox07
Explorer
Apr 29, 2017
I have some Proflex RV on order from Campingworld.com. However, after watching a few youtube videos, it looks like I also need Butyl tape. Or does the Proflex substitute for the Butyl tape?

I have the corrugated siding on my RV so the surface is not nice and flat which makes me think that I would probably need the Butyl tape to fill in the low ridges on the siding.

This is a video that looks like my situation and how I will attack my window. Let me know if I am on the right track.

https://www.youtube.com/watch?v=belS_95xLcA
DrewE
Explorer II
Apr 28, 2017
One brand that I've used with good results that's available at Home Depot/Lowes is OSI Quad. So far as I can make out, it's very similar to GeoCel Proflex.

Geocel and Dicor RV products would be available at Camping World, RV dealers/repair centers, and of course online. (Do make sure, if you get Dicor, to get the no-sag version. Perhaps more commonly bought and used is a different version, the self-leveling lap joint compound, which is for sealing roofs and is too runny to use on vertical surfaces. If you just asked for Dicor that's probably what you'd get. It does work nicely enough for its intended purpose.)
donn0128
Explorer II
Apr 28, 2017
If this is a clamp of flush window? The butyl seal on clamp windows csn fail. Before wasting time slathering sealant all over the window, take it out, clean everything throroughly, go buy a roll of butyl putty tape. Apply all around the window, reinstal. Clean excess squeeze out, now, apply a small bead of Dicor around the top and sides of the window. Now you have a professional, permanent fix.
prichardson
Explorer
Apr 28, 2017
Exterior sealants are available from Home Depot and such. Look for a major brand urethane or polymer based sealant for best results. Also thoroughly clean the area where you apply the sealant.
esox07
Explorer
Apr 28, 2017
Thanks guys. I figured there was some special sealant made specificially for RV's and similar outdoor projects. But, then, the follow on question is: Where can you find this stuff? Will it be available at a Home Depot or Menards or would I have to look to an RV dealer and supply outfit?
mbopp
Explorer
Apr 28, 2017
Ditto the Dicor (non-sag) or Proflex. If you use silicone it'll eventually peel and the residue it leaves will prevent anything else from sticking.
westend
Explorer
Apr 28, 2017
Don't use silicone on an RV exterior, it will degrade and eventually fail. Any of the better urethane or polymer sealants work well. A lot of folks on this Forum use Dicor or Proflex RV. I use Geocel Tripolmer construction adhesive (a cousin of Proflex RV) and it is holding up well.

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Water proof sealant

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