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Old 10-22-2019, 10:20 AM   #1
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Sprayable foam sealant?

I need to seal some underbody spots that an expanding foam sealant straw (like the Great Stuff ones) can't reach. Looking for a can that SPRAYS the foam rather than needing to get the end of a straw up to it. This is for stopping both air leaks and mouse entry.
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Old 10-22-2019, 10:39 AM   #2
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they sell some do it your self semi commercial versions of "great stuff" for larger jobs not positive how they apply. Can get pretty pricey.
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Old 10-22-2019, 11:17 AM   #3
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https://www.acehardware.com/departme.../caulk/1320514

Available at almost any hardware store. Other brands also available...Google "pond foam".
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Old 10-22-2019, 11:29 AM   #4
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Quote:
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https://www.acehardware.com/departme.../caulk/1320514

Available at almost any hardware store. Other brands also available...Google "pond foam".

That also uses a straw to apply at low pressure. I need to spray (shoot) the stuff to get it where I need it.
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Old 10-22-2019, 11:33 AM   #5
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Originally Posted by a2badger View Post
That also uses a straw to apply at low pressure. I need to spray (shoot) the stuff to get it where I need it.
How about a longer straw?
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Old 10-22-2019, 11:43 AM   #6
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Even though it is commonly referred to as 'spray foam' I've not seen 'sprayable' expanding foam in single can applications.

You are likely going to need to go to a two part foam and some of those are really cost prohibitive for a small one time application.

I've seen good and bad reviews on this inexpensive 'do it yourself' kit.
You usually get what you pay for...

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Old 10-22-2019, 12:09 PM   #7
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With a little ingenuity and an air compressor one could probably make their own foam spray gun using Great Stuff.

Start with a copper pipe Tee that has 1/2" or so main run with a 1/4 "Tap".

Add an air connection to one end of the main, and an extend the other end of the main run a few inches with some copper tube.

Figure out how to fasten the straw to the i/4" tap so it's not blown out when compressed air is flowing from input and out the pipe extension.

When you want to spray foam, press the button on the can. Foam mixture will flow, get caught by the air stream flowing through the Tee, and get shot out in small globs from the extension pipe. These globs will be deposited like wall texture material or stucco and start to expand as it cures. If possible use a smaller Tee but anything less than 1/2" is tough to find in most hardware stores unless you go to brass fittings.

That's the concept, maybe there are enough odds and ends in one's junk box to come up with something similar.
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