ZKTOOL 6PC Suction Cup Clamp Set, Class Clamps Kit for Car Convertible Glass Windshield Top Repair Gluing,With Sponge Pad…

I ordered 2 sets of these clamps to use in reattaching a glass convertible rear window that fell completely off the canvas top.The top was otherwise in good shape. I took the car to one of the few shops in the area that deals with convertible tops and they said it had to be replaced at a price of $2,500 (!). I called another shop and they gave me a price of $2,300.That price tag led me to researching replacing the top on my own. In the course of that internet search I came across several you tube videos showing people reattaching rear windows rather than replacing the top.I saw a number of different approaches using various materials. The one that appealed to me the most used suction cup clamps like these and 3M Window-Weld as the adhesive.Watching several videos was very helpful before taking on the project. I'd link to the ones I liked the most but Amazon doesn't like links off their site in reviews. However, it shouldn't be hard to find some on your own.Re these clamps: I liked the price compared to competing products. Most of the review were positive, which encouraged me. I read some of the negative reviews. They were mainly about the suction cups not holding.Given that the majority of the reviews were positive, I decided to go ahead and order these. They worked great. I actually had the suction cups on the glass for 2 days before I could get a friend to come over and tighten the clamps while I held the window in place. All the clamps held beautifully.I wonder if the problem some people had was related to their method. Here's what I did that may have made the difference.I washed the suction cups in very soapy water and degreaser to remove any oily residue that may have been left from the manufacturing process. Then I washed the window with a couple of passes of window cleaner, rinsed it well, then wiped it down with isopropyl alcohol to further clean it.I applied the suction cups to the window without the lever arms attached, using a bit of water under the cup and pressing down on the cup itself rather than the threaded bolt arising from its center.I don't know if that approach is what made the difference for me or if I just got lucky with my 12 clamps. In any case, if you get these clamps it won't hurt to take this approach. I hope it helps.Bottom line: my top is now repaired and working well for less that $100 in materials vs $2500

They worked as designed. I have a loose rear window on the convertible top on my Mustang. I used them to clamp the top against the glass while the glue dried. They stuck well and applied plenty of clamping power. I also used them to move the glass in position before I clamped them down. I left them on for two days and they all held fast. Definitely buy these if you need to glue rear window glass. They will save a lot of headaches.

Most of the cups do not stick at all and the others will stick for a couple of hours before falling off. Id get something better elsewhere

They did the job and the price wasn’t bad but suction wasn’t the best and the suction cups ended up melting with the heat inside the car and sticking to the window while we waited for the glue to dry.

The suction cups worked great. Easy to use, quality was fine and the process was done in no time.I’m giving four stars because one did keep losing suction. I will return the set and the company is sending me a new set. Hey stuff happens. For the price they are well worth it.

Worked great

After so many attemps Suction cup out of 6 only 2 with a stick.The others would stick and fall off After Applying the glue to the glass could not use The suction cups clamps. Now I have no way of holding the convertible top. Wasted my time and money on primer and auto glass glue.

I ordered 2 sets of these to glue the back glass to my convertible car roof. The suction cups all worked perfectly. Set the suction cups first and then attach the hardware/clamps.