Help locating GM type Buytl sealing tape

Greetings all:

I have endeavored to reseal all my weather-stripping in mu ongoing leak-fix madness.

The factory covered many seams beneath the weather-stripping with a black butyl tape that had a clear thick plastic back. This allowed the butyl to seal into the seam and the plastic film so you could remove and reapply the weather-stripping without a mess.

I cannot locate this tape anywhere! There is plenty of butyl tape on the market but it is all paperbacked and designed to be removed from the paper.

Anyone seen this and know how I can go about getting some?

The plastic back will not allow you to remove it without a mess. It will allow you to remove anything on top of the plastic without dragging the butyl with it. Any plastic film would replace the plastic you are referring to. You can then use any common butyl rope sealer, and put the film on top. After installing the butyl, painting it would serve the same purpose.

3M offers a paperbacked butyl product.

Been there tried that. Doesn't have the same bond that the black Butyl factory stuff did. Also, it really needs to be like the factory used and be plastic backed as the Butyl will stick the plastic and you can remove/adjust your gasket seals without a mess. With the paper backed type, the paper doesn't stay on.

I searched adnuseaum and there is nothing like it made anymore unfortunately.