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Sealants
3

Sealants

Sealants

(OP)
Hi,
I have a problem trying to seal a 3mm gap between steelwork with a material that will keep out water - specifically rain water. The material will be at ambient but it may have to be applied in very damp/wet conditions and set to form a flexible membrane.
I am not a specialist in adhesives but I am looking into silicon sealants and caulking compounds and would be grateful if anyone has any suggestions about a suitable material and types of hand/auto applicators and any specialist tubing that can be added to reach those difficult areas!
Thanks
PJ

RE: Sealants

Surface preparation is the key to success with any sealant.  Get the surfaces clean.  I mean really clean.  Otherwise nothing will stick.

If you are forced to apply in wet conditions, look at urethane based sealants that REQUIRE the presence of moisture to cure.

RE: Sealants

I would give these people a call with your problem. They have tapes and mastic that may work.

If there wasn't a requirement for flexibility you could use an underwater epoxy.

http://www.densona.com/index.htm

RE: Sealants

3M brand #5200 marine sealant is urethane based, available in caulking gun tubes from your usual supplier, and in small squeeze tubes from Wal-Mart.

It's very strong, will grip and cure on a wet surface, and will stay flexible in extreme conditions.




Mike Halloran
Pembroke Pines, FL, USA

RE: Sealants

(OP)
Thanks gents these have been helpful tips and we are now carrying out trials on several sealants
PJ

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