I'm in the process of adding a layer of fiberglass cloth to my plywood fins. When I remove the mylar sheets off the pressed fin, sometimes some of the fiberglass cloth gets stuck to the mylar and lifts off the plywood, resulting in half 'bubbles' at the edges as seen in the photos. The fin is throughly wetted with epoxy and it just occurs when trying to remove the mylar to trim the excess cloth in the leather cure stage. Do you have any advice or input in how to keep this from happening? The wood and cloth are wetted at each of these places, but it just seems like the localized adhesion of the cloth to mylar is greater than that of cloth to plywood....?
Thanks for your help!
My general process is as follows:
Wet one side of fin, add fiberglass cloth, add additional epoxy until transparent and smooth it out. Cover with sheet of mylar film.
Turn over, repeat with other side. Once both sides are done and covered with mylar, use squeegee to remove air pockets and excess resin from each side. Picture attached, but now I've started having excess cloth surrounding the entire fin but is similar to photo.
Compress under a stack of books until leather stage. Remove mylar sheets, and trim fiberglass using a scalpel.
Thanks for your help!
My general process is as follows:
Wet one side of fin, add fiberglass cloth, add additional epoxy until transparent and smooth it out. Cover with sheet of mylar film.
Turn over, repeat with other side. Once both sides are done and covered with mylar, use squeegee to remove air pockets and excess resin from each side. Picture attached, but now I've started having excess cloth surrounding the entire fin but is similar to photo.
Compress under a stack of books until leather stage. Remove mylar sheets, and trim fiberglass using a scalpel.