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Old 06-16-2013, 01:26 PM   #1
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Silicone Vs Latex caulk

I just replaced some rusted metal compartments. I am going to do some caulking underneath the coach and am wondering if latex or silicone would be a caulk/sealant of preference? Any thoughts would be appreciated.
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Old 06-16-2013, 02:11 PM   #2
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Don't know about where you're going to use it, but NEVER use silicone caulk where something else (like Eternabond tape) needs to stick to it! I only use the Dicor 502LSW on my roof, but I know you have a completely different application.

Good luck, happy trails, and God bless!
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Old 06-16-2013, 02:15 PM   #3
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Hi, I read on here that a few guy's or gal's said they won't use silicone on there MH's but they didn't say why . I prefer latex just because its easy to clean up after using "BUT" I just used silicone on my MH last week and last night while cleaning the windows I noticed that the Air Horns are loose and when I pushed on them water came out. They don't work anyhow so for the mean time I am going to take them off clean off the old junk and reseal the wires with silicone until I get new horns.
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Old 06-16-2013, 02:54 PM   #4
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Quote:
Originally Posted by spritz View Post
Hi, I read on here that a few guy's or gal's said they won't use silicone on there MH's but they didn't say why . I prefer latex just because its easy to clean up after using "BUT" I just used silicone on my MH last week and last night while cleaning the windows I noticed that the Air Horns are loose and when I pushed on them water came out. They don't work anyhow so for the mean time I am going to take them off clean off the old junk and reseal the wires with silicone until I get new horns.
Tim

Tim, it is my understanding that once you use silicone caulk that nothing else will stick to it, and it is very hard to get all of it off if you wanted to apply something else. It seems to me that it would be better to just use the right stuff to begin with! JMHO
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Old 06-16-2013, 03:03 PM   #5
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Spritz and Codgerbill, look in your users manual and use the type of caulk recommended by your manufacturer. If you don't have a users manual you may be able to download one from the manufacturers site. You may have to look in the archive section.
For example my owners manual states; "Sealant Types
General Maintenance – Roof
Rubber Sealant: Dolphin #7589 UVR Elastiseal
This product is used for large roof openings such as around vents, skylights, any roof mounted antennas and ladder roof mounts. Clean the old sealant that is lifting before applying the new. Make sure the roof is dry and free of dirt. This product is found in a tub container. Care should be used when near an edge, as the product will spread out. Masking tape may be used to mask around area to avoid mishaps.
WARNING
Use extreme care this product is flammable and harmful or fatal if swallowed. Use only in well-ventilated areas vapors can be harmful. Consult manufacturer for application and safety instructions
.

For small areas of maintenance various rubber sealants are available in a tube. These products are available at RV supply locations."

My read of their directions is that I should use a rubber sealent.

HTH, YMMV
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Old 06-16-2013, 03:41 PM   #6
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Do not ever use Silicone on an RV.

Some use Eternabond tape - Roof Leak Repair Products & Sealing Tape | EternaBond®
Some use Dicor - https://dicorproducts.com/catalog/ro...-lap-sealants/
Some use 3M marine - Marine Fast Cure 4200 Adhesive Sealant :3M US
We went with a product from Teak Decking - Teak Deck Company: Our Products: Teak Deck Caulk

Just no silicone!!!
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Old 06-16-2013, 04:31 PM   #7
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Quote:
Originally Posted by PyrateSilly View Post
Do not ever use Silicone on an RV.

Some use Eternabond tape - Roof Leak Repair Products & Sealing Tape | EternaBond®
Some use Dicor - https://dicorproducts.com/catalog/ro...-lap-sealants/
Some use 3M marine - Marine Fast Cure 4200 Adhesive Sealant :3M US
We went with a product from Teak Decking - Teak Deck Company: Our Products: Teak Deck Caulk

Just no silicone!!!
Great post. Thanks.
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Old 06-16-2013, 05:35 PM   #8
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I use nothing but Dircor anywhere on my coach, period. Latex is junk and the silicone a previous owner used had to be all removed (separated from contact surfaces) and I replaced with Dicor.
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Old 06-16-2013, 05:49 PM   #9
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Quote:
Originally Posted by PyrateSilly View Post
Do not ever use Silicone on an RV.

Some use Eternabond tape - Roof Leak Repair Products & Sealing Tape | EternaBond®
Some use Dicor - https://dicorproducts.com/catalog/ro...-lap-sealants/
Some use 3M marine - Marine Fast Cure 4200 Adhesive Sealant :3M US
We went with a product from Teak Decking - Teak Deck Company: Our Products: Teak Deck Caulk

Just no silicone!!!
I looked at the specs of the teak deck caulk and it says it is silicone.
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Old 06-16-2013, 08:57 PM   #10
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Latex caulk for exterior use underneath the coach is not a good idea.

Silicone has it's problems. It is not paintable, and the surface it sticks to is often not paintable even after the silicone is removed. Silicone does not always seal the surface from water intrusion.

Geocell caulking is better. One source - available at Camping Worlds. It adheres much better than Silicone, provides a lot stronger joint than silicone, seals 100% against water intrusion, and is paintable. The only drawback that I have experienced is that it has a short shelf life. Don't buy it and expect to be able to store it for 4 months before you use it.

Eternabond is great for sealing roof seams. It offers no structural joint strength. Dicor caulking is good for sealing things on the roof. Again, it offers no structural joint strength.
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Old 06-16-2013, 11:56 PM   #11
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The caulking from Teak Decking is formulated for marine applications. It is designed for mobile applications and to stay where it's at. It is/was used on the Queen Mary and Disney Cruise Lines. It is also used on multimillion dollar yachts.
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Old 06-17-2013, 06:05 AM   #12
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Thanks for the responses. I have checked out the 3M website and have ordered some 3M 5200. It looks like it will do well for an under the coach application.
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Old 06-17-2013, 07:42 AM   #13
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I've used 3M 5200 on boats and my experience is you don't want to use it on any item that you may want to remove in the future. It is very good and almost permanent.
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Old 06-17-2013, 07:56 AM   #14
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Just a quick point about the 3M 5200 sealant.

It is good stuff, but don't put it on anything that has to come apart. It is an adhesive as well as a sealant and it does an excellent job of both. Very tough stuff!
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