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Took the old cracked up one out and seems as if the hard tar looking sealer around it basically came out with it due to age & surface rust. Should I go in and wire-wheel out all the surfaces and coat with something?
Also, any suggestions on where to get a replacement & what to use to re-adhere the thing?
Originally they were held in with a Butyl Tape. You can buy a kit at a local paint and body shop. Most new cars use urethane adhesive which comes in a caulking tube. The Butyl tape is easiest to install, you just lay your tape on the windshield frame, but the urethane holds better. There you put a tall bead around the frame with your caulking gun about 7/16" tall. I personally would clean the windshield frame as well as you can. If you have any rust whatsoever, clean out those areas and prime.
I bought my windshiled from a local glass place for $120 including sales tax. I've bought several windshileds from them so they cut me a good price. Make some call to glass places in your area and work them. You should be able to get one for under $150.
Take your time to rust proof everything around the windshield in the normal rusting vette places before you put the new windshield there. Yes, whire wheel everything and prime it. You will never regret it.
Can't say if the glue won't stick to por15 but I suspect that glue will stick to anything. Let the pro's attach the new windshield and get a warranty.
You won't believe this but I farmed out that job on mine for a small hole from road debris that turned into a vertical crack. A shop replaced the windshield with a new one and checked all measurements and rust proofed everything on my instructions. When I came to pick up the car, it had a nice smooth new windshield WITH A VERTICAL CRACK some decimeters from where the old windshield had cracked, going all the way from top to bottom. The shop was stunned (or acted surprised, when I pointed to that the new windshield they had put on my car was cracked). They replace it again and now, five months later, this one is still in perfect condition. I'm so happy I didn't drive of their lot before I saw the crack.