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There are several Grades of Weatherstrip out there. Look at the big suppliers like Zip or Ecklers and you will see the differences.
Another point is to be sure to get a rear window with a molded 90 in it. I bought one and it was glued together which is not as good looking as the molded type.
Be sure to buy plenty of the Black contact cement used in weatherstrip installation. Have lots of whatever thinner works best at removing the old glue.
It is not too hard if you do it on a nice warm day so the material becomes more flexible. Don't freak when you see how the weatherstripping will appear to be too long. You don't stretch it while installing it and take your time to get it in place and then go back and glue it in and have some tape to hold it in place. Use the easy to remove tape...
I did both doors, rear window, and the Targa top seals. After I was done I could not get the doors to close very easily. After getting mine all nice and pretty I closed the door and the acrylic roof panel jumped 4 inches off the frame. That I paid to have re-installed. After a couple months I put silicone oil on the gaskets and they became softer and more pliable.
I just replaced the hatch weatherstrip on my 89 with one with the molded corners. No issues; just a little time consuming. I didn't use glue and it seals perfectly without the mess.
Ditto on the hatch seal. Use a liitle silicone grease on the gasket to glass contact area to aid closing as the new gasket will need to flatten a bit after installation. Other weatherstrip replacements were fairly easy ( windshield, targa top sides ( 2) and rear of targa/ front of Halo. Only tedious part is removal of old cement from the grooves rubber sits into. Best luck I have had so far product wise with weatherstrip has been with Corvette Rubber . US made quality stuff ( Previously learned the hard way with various Ebay items , car leaked worse and had more wind noise than with the old, worn out weatherstrip)
I am certain that quality weatherstrip from the various Corvette suppliers will work just as well
The rear hatch is one of the tougher ones to do as the weatherstripping appears to be about 1 1/2 times as long as it should be. I had to re-adjust the hatch seal once I saw how long it was going to turn out, this was because I fit the seal in place (dry) first and then I removed it and glued it in place. I used the black contact cement but much less than the guys at the factory did originally. I was lucky as I did not need to adjust the windows in the doors to get my seals to work.
I used some of the "Goop-Off" glue remover and it did a nice job of softening the glue to make it easier to remove. Just be sure to test it on your paint someplace out of plain sight.
The lessons learned by buying cheaper weatherstripping are loud and clear. This is one place you want the best quality weatherstripping and after it is installed properly you will not be doing it again for a while.
I am getting ready to replace the weatherstripping on my 1968 C3 Convertible and for the hard top as well. I have had the car for 29 years and never had to touch it. Finally the stuff is collapsed and does not seal very well.
Even when New the 1968 Corvette leaked when it was subjected to the rain and water entry test at the factory. I was reading the assembly manual for the C3 and it specifically said the over the windshield will leak as will the doors seals even when installed "properly". To this day I remember driving the C3 Corvette in Hurricane Andrew and every time I let the clutch out I got a few cups of ice cold water landed in my lap. It was the first time I had driven the Corvette in the rain and it was c-o-l-d water...
The key to healthy weatherstripping is to clean it and put some silicone on the surfaces every few months, I do it maybe once or twice a year depending on usage.
I replaced all in my 1994 C4. Made the mistake of buying off of Ebay. The rubber was very hard, doors did not shut and it was never getting better. Went to Zip corvette and bought the Latex version for the windshield and targa top, very happy with the purchase. I am now looking to replace the ws around the doors. Ecklers has rubber for $59 / pr, I assume that will be of better quality but will return it if not. Zip latex is $189.