Great Stuff Pestblock 12 oz Insulating Foam Sealant, Gray

Works freat. Really sticky. If you get this stuff on something, it ain't coming off without a fight. Supposedly, it has a bitter taste rodents don't like. I have never tasted it. I'll take their word for it. All I know is, I installed it 2 months ago, and none of it has been chewed. The only downside is, once you install the spray tube, and start using the foam, you have to use up the whole can. If you let it sit over night, you will not get any more out in the morning.

This stuff works great, and I plugged many holes in my rental property. I have no idea why Amazon asks for the flavor in the reviews, no one should ever taste this. One thing everyone needs to know about great stuff, is that it gets on everything, so always use gloves with this. Also I always use a full can at once cuz I've never been fully successful at using it later, it always seems to harden at the can.

Definitely easier to use than steel wool or copper mesh for blocking small (less than 1 inch) mouse holes. That being said, DO NOT ASSUME blocking the holes will resolve an infestation, or you'll be reporting what a lot of people here are -- determined mice ate through it in no time. Here's what you do to put an end to the problem once and for all; (1) Don't clean up mouse droppings. These are "hotspots" and the mice will return to them if they're left untouched. (2) Get some poison blocks (I like "Havoc XT") and three inch wood screws (you might need some washers). (3) Put three Havoc XT cubes on a woodscrew and secure it in to the floor/wall (whatever) where the dropping are. (4) Replace the cubes once a week until the mice stop feeding; it may take up to a month. In bad spots, you might need to put 2x or 3x poison. (5) Search the area around your hotspots for entry points... plumbing pipes/drains are a major culprit, but I've seen bad/amateur electrical work on exterior walls that punched right in to the vent space. (6) Fill holes/gaps *generously* (push the applicator straw in to the hole, spray for 2-3s, then continue spraying while slowly withdrawing. The can is single use, so go ahead and use it all. You'll want to wear gloves and safety glasses. as the stuff is impossible to get off your skin. If the mice never stop feeding, you're likely killing the neighbor(s)' mice as well, and you'll have to look at more drastic barrier methods (rodent control wire mesh). If the "hotspots" are on an interior wall (usually the wet wall where the drain stack is) the mice are coming up from the basement (or other apartments). If the hotspots are along the exterior walls, you're more likely to have mice coming in from outside.

The ratings ask about flavor? Seriously? Anyway, this should be combined with some copper mesh because a rodent that has been coming in through a hole will dig out soft foam to re-open the hole. If it hits sharp copper mesh that is stuck in place, that should stop the rodent. For rodents new to the neighborhood, foam that expands to stop air flow and the aroma of food from coming out the hole should keep them from being attracted. I poked copper mesh in to the center of the wall, then sprayed foam in from both sides. This stuff continues to expand for about 10 minutes after application. It is easier to trim back flush with the wall while it is still soft, but that is a bit of a gooey mess. Bring paper towels. Be ready to do all your holes in one session because the nozzle will plug up when it dries.

Doesn't really block anything but bugs in my experience. Only slows down other pests who are able to dig, push, or rip through it. Trust me on this... You're going to need steel wool or some other metal mesh where they're getting in and then spray the foam over it.... that's if you want to block anything mammalian. If you can rip the foam easily barehanded just picture what a burrowing animals claws can do. Now realize they were probably born in / around the place you're trying to exclude them from... They believe your home, barn, or garage is actually their residence and you're just the giant loud predator who shows up making noise occassionally and then leaves. You think if they avoid cats, hawks, owls, and foxes they care you and your foam are standing there pantsless at 6am? If you're reading this I know you're wondering if there is some sort of cheap way out of this situation... maybe even sans pesticides... I've yet to find it. This is product should be used like you'd use a shower curtain to keep water off the floor... it will discourage pests and it will create less avenues for them to escape to while you're banging on a lobster pot, in your underwear, on Sunday night hoping to drive them out. The great war on uninvited and unwanted intruders requires cunning, skill, and more than just foam no matter how many layers you apply. I could write a book, maybe a script... I'm looking for an executive producer Amazon. You have my info... call me.

It's simple stuff, but it works great. It should be noted that you'll really only get one good use out of this can, as the gunk in the spray hose becomes solid after about an hour of non-use. Knowing this, I went around the entire house and sprayed every crack and crevice I ran across, regardless of how ridiculous it looked. Once it dries for about 24 hours, you can go back and trim the foam and make it look good again. The spray that comes out of this can comes out grey, but will turn yellow over time.

This stuff isn’t cute and will most likely get all over you. But, my bathroom isn’t cold anymore. I got the bug kind cause, why not? It covered all of the “leaky” areas in my bathroom that I didn’t even notice were letting in cold air until I sealed them off with this miracle sauce. Wear gloves, and don’t touch anything! Make sure it has stopped oozing out before you move the can or you’ll get it on your pottery barn shower curtain!

Got this to fill in some voids around holes cut into base plate of house just above foundation used to run inlet and outlet PVC pipes for condensing furnace as well as the lines from the outdoor AC unit. Having learned the hard way in using expanding foam in the past and having it create a mess due to the extent it expands and it's glue like stickiness, I took care not to overfill gaps and wised up and used surgical gloves. This doesn't expand about 10x as some others do by the time they finally set, which is good. But for anything but large voids, you can't avoid it expanding further than flush. If it matters, the excess can be safely carved off with a knife or saw. It's a one use can, as the product will likely harden in the valve and render it useless after time has passed. So I looked around for other voids I might fill and found some in the area where ducts entered the chimney. In general, this stuff is very good for filling voids where sealing and insulation are required. Only real downside is as I mentioned, that it's pretty much a one use can and unless you have a lot to fill, will likely end up wasting a lot of it.