Author Options:

Where can you buy (cheap) expanding foam? Answered

It can expand in water, hot air, cold air, or some where else, but I have a strange craving for the stuff (as long as it's under 30 US dollars).



Best Answer 8 years ago

Are you in the US? They might sell it other places, but I get "Great Stuff" from The Home Depot, and, as the name depicts, it's great stuff!

Quick advice:

1) READ AND BELIEVE THE SAFETY LABEL. Most of these foams are first cousins of polyurethane adhesive, and will bond immediately and aggressively to anything containing moisture, including human skin. They don't wash off, they don't rub off; you're stuck with (and to) them until they wear off (or the skin under them does). Safety goggles are essential, gloves are highly recommended, work in an area where spills aren't a disaster, and be careful. Afterward, dispose of the can appropriately -- in most areas, that means treat it as a Hazardous Material and bring it in on your town's HazMat disposal day; do NOT just toss it in the trash.

2) READ AND BELIEVE THE USAGE LABEL. These foams are also excellent sealants, and will happily seal themselves into the can if allowed to sit for more than an hour or two. To avoid wasting materials (and money) , think of ALL the things you want to do with the foam, make a checklist, and get everything ready before you start. Also, understand how strongly that particular variety expands (stronger and weaker foams are available) and whether it's fire-resistant or not, before deciding whether that particular foam is appropriate for what you want to do.

Used with appropriate care, expanding foam is a useful tool for sealing things, holding them in place, or simply building up large objects. (I've seen a car-sized sculpture which was made by applying layers of this to build up the general shape over a supporting framework, then trimmed to refine the shape and painted.) But it's definitely a tool you can get yourself in trouble with if you aren't careful.

BTW, that car-sized sculpture: Head of an oversized Chinese Dragon.


The lower jaw was articulated (on bungee cords, I think) so his mouth opened and closed has he moved, the eyes were lit (powered by a hefty gel-cell battery pack)... Technically, Irving was just a prop for a stage/costuming effect, but he was one heck of an impressive prop.

(I helped a bit with last-minute affixing some of the scales and wound up playing the part of "third rib" during the presentation.)

"or somewhere else" - Why not just say "anywhere"?
Look for these things (not "anywhere" but most places) - they rely upon a little-bit of moisture to set them off.


You can buy cans of the stuff at any home improvement store.  Specifying a price without a quantity is meaningless.