Sealant for lexan windshield and skylights

What is the best and readily available product for sealing the lexan skylights to the aluminum riveted frames and the windhield to the fiberglass molding and lexan windsheild.
I have heard Bostik 1100 FS urethane sealant mentioned, but that is not readily available. Some have suggested using a GE silcon sealant. I understand it has been suggested it should be a sealant that stays plyable and could be easily removed. Not that I am planning to take these parts off.

Reid

Be careful with silicones, paint will never adhere to the area. I used a polyurethane sealant (black) that is paintable. Still flexible to the touch after two years: http://www.loctiteproducts.com/p/pl_...ng-Sealant.htm

3M also makes a windshield sealant but boy is it ever nasty stuff to work with.

There is a commercially available product called lexel, which I've used successfully in the past on both Plexiglas and Lexan. I've bought it at HD or Lowe's in the past.

http://www.sashco.com/hi/lexel.html

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Originally Posted by Rhuzzey

What is the best and readily available product for sealing the lexan skylights to the aluminum riveted frames and the windhield to the fiberglass molding and lexan windsheild.

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I suggest one of the polysulfide windshield/window sealants like 3M Aerospace Sealant AC-251. It's made for exactly what you describe. Mask off 1/8" on each side of the joint, mix it up and brush it over the gap with a 1/2 length acid brush. Pull off the tape, let it sit overnight and voila! Won't have to worry with it again. Wear gloves cause it takes ~2 months to get it off your hands.

Thanks for the suggestions. What about using a butyl sealant /calking, like used on glass window frames?