GREAT STUFF PROGaps & Cracks – 24 oz Fireblock Foam Insulation Sealant – Closed Cell, Polyurethane Expanding Spray Foam Insulates & Seals Gaps Up to 3", Pack of 12 with 2' Long Nozzle Gun

I have been using this stuff for about 15 years. During covid locally ,the sources dried up ,so I was very pleased to find it at AMAZON. BECAUSE THIS IS REQUIRED BY CODE I was using the smaller cans which don't go nearly as far, it is distortions how much further this stuff goes. It was very convenient to get the foam gun ,and cleaner in one box. This is easy to use but a couple things to remember, it is best to do it all once as not to waste cleaner, keep the product warm but not hot,and before using shake the can vigorously. Obviously cleaning the gun is super important.

I purchased a modest, relatively small (400 gal, "6-seats" but really 4) hot tub and installed it on my upper deck earlier this year, a big project both requiring substantial strengthening of the deck itself and then significant improved insulation for the tub itself, including panels beneath the deck where the tub sits, panels inside the spa cabinet, and foam for inside the base and coating the tub seats within the cabinet. I ordered this spray foam for the latter (base and seats). I used every can of it but was also able to install a nice 3" insulated floor and a good 2" shell around the seats within the cabinet. It took a little patience, as I had to put just a bit at a time in a given spot, especially on vertical or partially inverted surfaces. Then, as the foam dried and left something to "bite," I could come back and add more and thicker quantities at a time. I can tell that the tub is now MUCH more efficient at both heating and retaining heat than how it originally came, almost completely uninsulated. Separately, I added 1" foam sheet insulation to the cabinet walls and more 1" foam sheets to the underside of the deck and both of those helped as well. In the process I learned the following:SHAKE THE CANS VIGOROUSLY FOR AT LEAST A MINUTE, IF NOT MORE. That makes a huge difference in expansion and getting most from each can.Spray with the can nozzle pointing down, so all the goo finds its way out.Don't do too much at a time, or the weight of added foam will collapse the lower layers.Keep a towel or sheet of wood or cardboard beside your work space to divert any messes while in-process, as well as a can of acetone & paper towels to clean up and keep the tip of your sprayer clean.Good stuff!

I had no idea how much I was going to need to insulate the gaps in my new 30 X 30 building. I was able to the entire perimeter with less than one can! The tips are no good as the foam pressure blows them off but the 2' wand minimizes the effort of having to bend over. The trigger adjusts the flow, plus the flow knob gives a further refinement. When installing the cartridge, spin it on fast or the product will come out. Good news is the attachment ring is made of a non-stick plastic so it's easy to peel off. Get cleaning can to clean out the wand when you are done. Great stuff!

Couple tips if you're use to using larger canisters of closed cell insulation.The first few cans didn't have the psi I'm use to. Only about 10% would stick to the wall. Wouldn't be a huge deal but some of the area I was filling was a little far.Thought I'd try putting them under a little more heat. Put them about two feet from a small 1,000 watt heater for 45 minutes.BTW I had them in a room at 70F before this for a couple nights. It wasn't enough.Heating these up seemed to do the trick. The increased heat gave it the extra psi to hit hard enough and stick.You'll still have to plan a little more if you're use to larger canister type sprays.Inly about half the can will have a fair amount of pressure. The rest you'll need to put directly on.It's possible I could have just heated them up more. I wasn't sure how much was to much.For the R and sf, I think it's a pretty good deal.Also. I had no problem with anything clogging. I went through 12 cans in a row and had no problems at all. I'm guessing the people who had problems, probably didn't read the directions about how to change cans correctly.

I like being able to bulk buy this product and have it delivered. Only complaint is it does take 1-2 weeks to arrive but if you plan for it, it's a great time saver.

I purchased this kit to work on air sealing my 1980's house. So far it has worked great. I've done most of what I was intending and have only gone through 3-4 cans. I've done around all of the vents and other ceiling penetrations and around the wall headers the best I could in the attic, as well as all of the plumbing penetrations throughout the house, as well around all of the HVAC vents inside the house. I have a bit more to do in the attic, but I don't expect to exceed 6 cans for the whole house (a 3,000+ sq/ft house, BTW). Being fire block rated, they are suitable to use around electrical boxes, which is nice. The gun works really well. I haven't had any issues with connecting the cans or any leakage. The foam doesn't come out uncontrollably like they do with the spray cans, and the flow is remarkably controllable with the trigger. The cleaner helps keep the gun clean. I wish it would spray upside down, but otherwise no complaints. It's a really great product and 100% recommend.