I was told by a tech guy at Morris 4x4 Center to only use a small bead of silicone sealer between the cowl seal and the w/s frame. I did, however, have to lower my windshield frame about 1/8" of an inch. The bottom of the frame had a slight bow from left to right, giving me a 1/16" gap in the middle between the cowl seal and the tub. I think they say that so you can still fold down the w/s. If you never fold it down, and want to PO the next owner, seal it top and bottom. Just my 2 cents.
Go with 3M strip sealer if you want to go with similar products to the original. It stays pliable and takes paint if you should want to do that. I painted my fenders and tub separately and then used the strip between the two.
cool. the only think that worries me about the sealer is like mentioned in other threads, like silicone, will it emit chemicals over time that break down the rubber cowl?
I know that there will be times where i will want the w/s down so it it is affixed with either, will there be enought give to keep the front lip from getting distorted and not sealing right when back in the upright position?