Great StuffPRO Gaps & Cracks | Gun-Applied Insulating Foam Sealant, 24 oz. – Cream (12 Pack), 341557

Nice stuff and wish it was a way to cap it and store away for future use..

Filled some cracks. Then filled a couple of wasps nests. I think the wasp nests were more fun. Great stuff though. Oh crap! What is this called??

The good:This expanding foam is black in color, so it hide / blends well into natural landscaping decor. It if formulated for ponds and terrariums, so it does not contain chemicals which are harmful to plants and animals. It helps hold objects together while providing some degree of water proofing / resistance.The bad:This is about 2-3 times the price of yellow expanding foam. Directions state is is "fully set in 8 hours", "cures rigid" and "can be cut, shaped, and sanded". This is not exactly true. This foam expands very slowly for a couple hours. So you will spray it into a shape or between a couple objects and when you return 4 hours later it will have completely pushed the objects into different spots due to expanding pressure and it no longer resembles what you were looking for. Then after it cures when you cut and shape it, it spends then next 24 hours collapsing and deflating. So, you need to wait about 3-4 days before you carve, then take it slow and carve a little here and there over a couple days to get the desired shape. I sprayed a layer of foam covering a 3' x 3' area. After I carved it, it lost about 6" in length and width as it shrank back down. Also, it is not as rigid as you would expect, it will bend and twist to some degree.Summary:There are not many options if you are looking for aquatic spray foam that is safe for plants and animals, so this is probably your best bet. But depending on application, give it a long time to cure and take it easy with the carving. Be prepared to spray layers to fill voids created when it re-shrinks.

This stuff was great, it did its job. However, a little bit got in my hand it was very sticky! Hard to remove, so the second time around I wore glove just incase. I also use a spray nozzle attachment which made it a 1000% easier to use. (Sold separately)

Hi, in addition to being a homeowner DIYer, I have several BPI certifications and teach residential and commercial energy conservation, which includes air sealing and insulation. If you are considering using mono-component foam for more than one very small job, be aware of a few related facts. Firstly, mono-component spray foam expands very little, no matter what kind you buy. If you need more expansion, you have to get a bi-component product such as Tiger Foam (to spray wall cavities or rim/band joists). Secondly, the spray bottles you buy at the Home Depot should be used all at once and not stored for a long time before using or they get clogged. This is true even for the ones rated "reusable". Thirdly, these products are typically not fire-rated. Dow Great Stuff Pro needs its own dispenser gun. You can get the least expensive of the 3 which costs around $30 and will last you a long time if used correctly. Hence, this product is more expensive at the beginning but it has the following advantages: the foam is fire-rated; MUCH better dispensing control in terms of bead size and consistency; no overspraying when you release the trigger; the same bottle can officially stay on the gun for 1 month but users report that they are having no problems after 6 months. Two final points: spray foam is the best air sealer and insulation on the market but is expensive. For larger jobs such as open wall cavities, consider laying down no more than 1" of foam first and then adding much less expensive bat insulation on top of it. Do not underestimate how wickedly sticky this stuff is. DO NOT get it on your (good) clothing, skin, hair, glasses, etc or else. I found that Amazon is the right place to get foam and gun in terms of price and availability.This foam cures with the moisture in the air. In dry weather, moist (not soak) the cavity you want to fill with a light spray of water before applying the foam. You will get twice as much expansion and no voids.

Sets great, works great

Short version: I love, love, love this stuff. I use it instead of Liquid Nails for glueing together lumber, glueing polyiso foam board insulation to plywood, drywall to lumber, and instead of the "Gaps & Cracks" spray foam for filling gaps and cracks. It sticks to darned near everything (including me!), has an extremely aggressive adhesive (it takes 3 days to wear off my skin), and a very strong bond.Background: I'm a DIY homeowner and I just ripped the siding off my house, added 6" of foam board insulation, and then resided it, with a side dish of all new windows. I used this foam extensively throughout the project with great results.Things I've noticed while working with it:This Wall & Floor formula expands less than Gaps & Cracks. I had no trouble using this along door framing and it didn't cause the jamb to warp. My theory is that so long as there's air space to expand into, it will expand there. I have a can of Door & Window foam but haven't used it yet, because using this (which is on my gun already) has not caused me any heartache.The working time is comparatively SHORT! Like 15-30 minutes. This is a double edged sword. The fast curing is convenient when filling gaps and cracks. However, I was installing two layers of foam and while working my way across a wall, the foam could harden before I got the second layer on, taped, and strapped to the wall with furring strips and 9" screws. I found myself making more cuts in advance, testing fitting, and then re-assembling all the layers and foaming as I went. Compare that to Liquid Nails, which I usually open a giant (28 oz) tube of, and leave open in the caulk gun all day, since its cure time is 24 hours.

Excellent

Didn’t get this product

Didn't deliver on it's promises. Foam only partially expanded and there was not enough in the one can to fill a relatively small hole in a tree which was what the intended use was. Disappointing and won't buy again.