RE: Installing new helm seat
*for future refrence. Or for those other doing the same job. if you make your last covering a veil, sort of a fiberglass tissue paper.* You won't have the glass matt showing thru. Dirt gets in there and really shows later. Makes a real smooth surface.*
Looking at your pics.*If your deck flexes when you walk on it, you may have some delamation issues. To get a good bond wherever you have an attachment it must be ground down to bare glass. *Fiber glass doesn't like voids or air pockets. and it doesn't bend at a 90deg. You really need to roll all the air pockets out of the resinated glass.
Woven Roving comes in a tape of different widths. If your edges do start to come loose.* I would grind back to glass and tab the edge with it.
Comes with the experience of all the glass work I have had to redo.*
Greatest thing about fiberglass is you can always grind it*back and start over.
As far as those 90deg turns, you can make a paste of cabosil ( powdered glass and resin) I use a rubber spatula to form a cove so the glass can bend at about a 3/4" radius. Especially where your sidewalls meet the deck