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Old 04-29-2005, 07:39 AM   #1
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sealant @ Furnace vent cap

Hi all,
Finishing the replacment of a new suburban furnace in my 66 safari. Is it OK to use Velkum at the exterior vent cap. Install instructions don't specify which type.
Thanks for the help. A/C is next.
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Old 04-29-2005, 07:54 AM   #2
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I actually called Suburban tech support when I was re-installing my original furnace. I was actually looking for replacement parts, but while I had them on the phone, I asked the same question. The guy told me that any urethane sealant would be fine, as that spot doesn't actually get all that hot. your "new" furnace might be a different situation, though...main point is that you can call them and ask.

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Old 04-29-2005, 08:53 AM   #3
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Thanks Chuck,
Heat was my main concern. It seems like the heat resistant stuff is usually silicone (a big no no ) Thanks for the response.
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Old 04-29-2005, 10:54 AM   #4
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caulk talk

Originally Posted by BURNZEE
...Heat was my main concern.
I don't know about Vulcum but Sikaflex-221 has pretty good heat characteristics: up to 355 degrees for 1 hour and 320 for 4 hours constant.(See attached PDF) How hot do you think that the exhaust gets?

I bought some Vulcum after using up my first tube of Sikaflex-221 and didn't like it as much. It seemed to dry a lot slower and didn't have as much initial tack.

Now I'm using Sikaflex 295 on my windows where the weather stripping has hardened and it's working really well.

Good luck,

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Old 04-29-2005, 12:27 PM   #5
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Thanks Steve,
If it gets hotter than that I'll have other things to worry about besides the exterior sealant. I've actually got a tube of 221 but haven't opened it yet. Been using Velkum 636, but just ran out. You mean I've got just what I need,, that never happens. Thanks
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