Dicor self leveling lap sealant to Silicon

[iyamtony]

Im sealing the trim around a new roof on my Motor Home. I need to meet a silicon bead of caulk with Dicor self leveling sealant. Can anyone tell me for sure if the two will bond and seal properly at the joint? Also what should the temperature above be for applying the sealants? I have heard different opinions. Thanks in advance.

 

[lenbeal]

On the lable of the self leveling tube probably has a 1 800 number. Should give you the info needed.. The self leveling stuff is great. I keep 2 tubes in the coach all the time...

 

[Hfx_Cdn]

    As Len said, the best place to get info is the 1-800 number.  However, I have always, made sure the silicon was cut back as far as possible, then used the dicor.  As for temperature, I think the label gives you that information, but there too as Goldilocks says "not too hot and not too cold", So I usually try for a day between 65 to 80 F.

Ed

 

[Gary RV_Wizard]

Not much sticks well to silicon. Not even more silicone. You can butt up to it, but the seam will likely NOT be waterproof.

 

[dave61]

What Gary said. In the marine industry silicone is hated by most who work on boats. Nothing bonds well to it and it is tricky to totally remove it. Seems there is always some left behind.

 

[iyamtony]

Thanks for the replies. I did talk to Cathy at Dicor and she also said that no the joint will not be a good joint. she also stated FYI that the temp should be above 40 degrees. Thanks again.

 

[Rex]

NEVER use silicone.  Nothing will stick to it.  The only thing I have found that worked for me in removing silicone is denatured alcohol and 400 grit wet/dry sandpaper.  An excellent caulk is Geocel 2300.  It comes in clear, white and black and is available from ABS supply a national company.  They supply all sort of roofing products and mainly wholesale.  Next best is another product made by Geocel - Proflex RV available at Camping World and most RV dealers.  Also comes in clear, white and black.  Both products can be painted if need be.

 

[tvman44]

As others have posted good luck trying to get anything to properly adhere to silicone.  I would remove the silicone and clean real good then cover with the Dicor.

 

[Gary RV_Wizard]

Silicone can be removed with mineral spirits and a lot of elbow grease (lots of both scraping and rubbing/wiping). There are products made to help soften the silicone for easier removal - it is basically jellied mineral spirits.  It is jellied so that it will cling to it for the couple hours it takes to soften it, but you still have to scrape and rub and clean repeatedly.

 

[gregwest]

Gary, I applied silicone yesterday to some of the roof calking. What is the safest way to remove the silicone from the calking?  :-[

thanks,

greg

 

[Gary RV_Wizard]

You can probably peel the silicone itself off, but the oily residue remains and that's what causes future problems. if all the silicone itself has peeled off, mineral spirits might be sufficient to get the silicon oil off. That and some years of weathering! The roof caulk itself will survive the mineral spirits ok, but don't slobber it onto a rubber roof. Anything more than a dampened cloth and it will penetrate the EPDM and loosen the adhesive.

There are a couple videos on You Tube on this subject - maybe some help there:

http://www.youtube.com/watch?v=Ry8E-BQxW14
http://www.youtube.com/watch?v=Ry8E-BQxW14

 

[Wizard46]

Lowe's for one sells a silicone caulk remover in a spray bottle. It helps but still is a lot of work, a plastic putty knife helped me some.