Silicone

I don't/won't use the old clear silicone for anything anymore. It has come loose of everything that I've used it on that's three years or older.

Go to the nearest RV shop and ask them what they're using.

Bill

Dicor.

Go to dicor web site and learn where dicor goes and vertical or horizontal surface. Go to youtube and view many vid's on prep and application. Silicone has only a few spots it's good on rv.

Thanks. Will check out Dicor.

There are other good options, but I use dicor lap sealant for horizontal surfaces (like the roof) because it is designed to settle and spread out a little bit.

On the sides I really like ProFlexRV... it's sticky and stays where you put it.

For seams between surfaces that are out of sight (like a roof) I use Eternabond tape. It's more visible, but it's far more permanent.

Just make sure you have clean surfaces!

I will say that whatever you use, if things are splitting and cracking you will need to stay on it. Check the problem areas twice a year and check everything at least once a year. Visual checks aren't too difficult and preventative maintenance is the best way to keep the water out.

Juzaxadar wrote:
There are other good options, but I use dicor lap sealant for horizontal surfaces (like the roof) because it is designed to settle and spread out a little bit.

On the sides I really like ProFlexRV... it's sticky and stays where you put it.

Ditto

And the only place I use Dicor is on the roof.

For other areas I use ProFlex RV from Geocel. Lots of RV factories use it as well, for walls, around windows, etc.

There are two types of dicor one for horizontal surfaces and one for vertical surfaces.

Proflex is a good caulk for trailers and made for trailers.

OSI Quad can be found at Home Depot and Lowe's and it comes in colors. It is a polyurethane caulk that works well for sealing around doors and windows on houses. It will also work on travel trailers.

Agree with what has already been listed above.... Dicor on the Roof, Proflex on the exterior walls, trim etc...

DO NOT USE SILICONE!!!!! It has poor adhesion and UV resistance, it will break down extremely quickly and leak....

If you must use a cheap alternative I would suggest Butyl Gutter Caulk, which can be purchased from most hardware stores. It holds up quite well but will pretty much be there forever. It worked fine on my old hunting rigs, but I probably wouldn't use it on anything that you want to keep looking nice.

Double post.... Deleted...

Never silicone where the sun's UV can get to it. You friend will soon have a mess to clean up when it yellows and starts letting go.