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Old 08-28-2011, 04:55 PM   #1
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Bethany533's Avatar
1983 30' Airstream 300
Covington , Louisiana
Join Date: Aug 2011
Posts: 54
Sealant for water heater

I will be installing my new water heater later in the week and have a question regarding what type of sealant to use. I've read through some of the old posts and I'm not sure what type to get. I know that silicone based sealants are a big NO. As long as I use a polyurethane based sealant does it matter which brand? I know I need a no-sag type since it will be on a vertical surface. Am I correct in my thinking?

I've looked for the Vulkem and Sikaflex locally and cannot find it (New Orleans area). Many of the posts mentioned Fastenal but when I go to their website, they don't have either product. Any suggestions would be greatly appreciated.

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Old 08-28-2011, 05:10 PM   #2
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1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
Join Date: Oct 2010
Posts: 2,406
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I used the jTempro 636 (vulkem) ordered from one of the onling suppliers. worked well.

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Old 08-28-2011, 05:17 PM   #3
Join Date: Jun 2010
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Bethany you want to use either a putty tape or even better a butyl tape. Both are available from any RV dealer. The as a secondary seal use Vulkem. Vulkem is no longer used as a brand name.
10.1 oz Aluminum Tremco TPV626 300 mLC 1-Part Polyurethane Textured Masonry | Fastenal
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Old 08-28-2011, 05:42 PM   #4
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1968 24' Tradewind
Oxford, , Mississippi
Join Date: May 2009
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I used Tempro 636 as well. Fastenal has it. I have had zero leaks around the heater.
Bruce & Rachel
68 Trade Wind
2001 Toyota Tundra
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