Metal Roof Dicor/311 sealent

Glad you had good adhesion with the 311. I have never used 311, but every time I have used other silicone over silicone residue it didn't adhere well.

Many years ago I use to do adhesive research, and I can say this, for the best adhesion, clean surfaces are extremely important. It sounds like you have already figured that out.

TreeSeeker wrote:
Nothing sticks to silicone--not even more silicone. You are going to need to get it all off. There is a substance that is supposed to help remove it, but I have never tried it. Can't remember what it is called.

I've used Dicor and I like it.

Well the Winnie was originally sealed with 311, which is silicone based self leveling RV sealant. I cleaned off some old original sealant and put some new 311 on it. Stuck to it no problem. That said I did have to redo the sealant around my radio antenna so I peeled it off, got some spray silicone remover from Home Depot and a wire brush, took it off no problem. Cleaned the area with acetone and put some new 311 down on the antenna, good to go.

Now where I used Dicor on the previous unsealed objects (luggage rack roof mounts and tank vent screws) The dicor stuck to the metal roof no problem. However where it overlapped on the original 311 sealant, it stuck, but pulled off easily. Needless to say I will be redoing the areas where there was overlap with all 311.

I know dicor is preferred but when it comes to OEM sealants - and the fact that I do not want to redo the whole roof - I will stick with the OEM stuff. At least its not pure household silicone :)

Nothing sticks to silicone--not even more silicone. You are going to need to get it all off. There is a substance that is supposed to help remove it, but I have never tried it. Can't remember what it is called.

I've used Dicor and I like it.

Dicor wrote:
Hi Biggyniner,

Since your unit originally had a silicone based sealant, you will want to use that same sealant. The Dicor lap sealant will not be effective in this circumstance because it will not stick to silicone, and you will likely have some silicone residue left on your roof.

Hope this answer is helpful and good luck with your repairs. If you have any further questions, feel free to call Dicor at 574-264-2699.

Safe and Happy Travels!

That makes sense for patching I suppose... For whatever reason the screws around the tank vents were not covered in a sealant... i used Dicor on these since there was no previous sealant.. Hopefully that does not cause an issue.

Hi Biggyniner,

Since your unit originally had a silicone based sealant, you will want to use that same sealant. The Dicor lap sealant will not be effective in this circumstance because it will not stick to silicone, and you will likely have some silicone residue left on your roof.

Hope this answer is helpful and good luck with your repairs. If you have any further questions, feel free to call Dicor at 574-264-2699.

Safe and Happy Travels!