XFastenButyl Tape Black, 1/2 in x 30 ft x 1/8 in – Easy-to-Work-with Automotive Butyl Sealant Tape, Mess-Free Rubber Caulk for RV, EPDM Putty for Window, Headlight, Roof, Windshield, and Car Doors

Got guys who installed my Yardistry gazeboo crush several screws and damage roof sheets which led to small by annoying dripping under heavy rain. Tried special roofing caulking with no success and ended up applying this tape. It got tested by a couple heavy rains and so far seems to hold well. Will provide an update if it starts leaking. Looks like a really solid product perfect for insulating metal roofing seams.

I must have gotten lucky! it arrived to me almost perfect. Despite that one review about packaging, I believe it was just the right amount. It didn't even arrive in a amazon box or bag which right there saves material. Appearance is perfect. I have yet to test it out. I plan to use it for the vapor barrier for car doors.

great packaging. works great.

Received what was described.

I purchased this butyl tape to try to address a seam in a corner weld on my seawall which has gaps of 1/16" to 3/8" but reside underwater.My plan was, to apply this butyl tape under the water (during actual installation of the tape) and hoped that forcing the flexible tape into the "crevices" of the seems would help hold it in place.On the day I did my attempt, the air temperature was in the low 70s and the water temperature was in the mid to upper 60s. The surface material I was trying to apply the butyl tape to was steel.I suspect there was no real adhesion for three reasons:#1: underwater surface makes for tougher adhesion in the first place (though with most butyl tapes, underwater adhesion is certainly achievable). In this case, this is a Chinese product, so who knows what all is mixed in with it, versus it being a 100% butyl product (like the Anderson brand).#2: temperature of the air was already on the somewhat cool side for maximizing adhesion with butyl tape, added to that, the water temperature was on the lower side for good butyl tape adhesion.I will try to install the tape again, waiting for the air temps to increase and the water temps to reach at least the lower 70s. If under these conditions, I find that the tape actual does adhere, I will update this review with the that information.For my need, sealing a gap in a corner seem of two pieces of steel (gap measurements above) below water, the width and thickness of this particular tape was sufficient, I ordered the 1/8" X 3/4" wide. You can double or triple this tape up as necessary if you are sealing a gap that varies, which is nice to be able to do.For those looking for confirmation that this butyl tape can be applied underwater (actually installed underwater), so far I cannot say that it is capable of doing this - and I can with certainty day that it cannot do it in all instances.Hopefully in the coming few weeks, I'll have an opportunity to make another try when temperature conditions are better and find that it does work. In the end, it is always nice to have a roll of butyl tape around, there are a lot of good uses for it.The one thing that concerned me and caught my eye, in the Questions section, the "seller" replied to another person's question that the tape is a silicone butyl tape. But I suspect this was just a chinese seller trying to tell the potential customer what they wanted to hear and in reality, the chinese seller really doesn't have a clue what this stuff really even is or is not.

it good. it make plastic stay in place. strong like bull. very good, sir.

My husband used this for a roof. It worked as expected.

Great item and was an easy install. It seems durable and the thickness is what I needed.