To prevent wrinkles make sure the glass comes rolled when you buy it. It it is folded for some reason and there is a crease, try leaving the glass draped over the boat for 24 hours before applying resin. If that doesn't work, hang some spring clamps off the edge of the glass to pull the crease flat.

If you end up with wrinkles after applying the resin, you can build up epoxy around it so it doesn't make as noticable a bump. If there is air trapped under the glass, you can try injecting resin into the bubbles. If the bubbles are small, just ignore them. If they are really big you can sand way the glass and apply a patch over the area.

: I am building my first kayak (a Great Auk modified to 15 ft.) and last night
: I finished glassing the hull. I noticed there were minor creases in the
: cloth when placing it on the hull, but I figured they would flatten out
: and disappear after wetting out. I was wrong. Now I have lines across the
: bottom of the kayak, some of them have air trapped beneath. And the
: aluminum fiberglass roller didn't help. What is the best way to fix this
: and how do I prevent creases in the future?

: Any help would be much appreciated.