A nearby city should have a yacht club who should be able to find a cooperative Sunfish owner or three. A half-day rental? A neighbor? A free Sunfish from Craigslist? Advertise for one—"Wanted". Craigslist ads are free, and there's always somebody around who's storing one and would like to have the space. Familiarize yourself with "clones", some of which have identical hulls. (Viking, AMFlite, List).So, where to find a sunfish to make a bow mold?
1) Epoxy should be able to do the whole job. The main disadvantage with epoxy is that unless you do many minutes of layering all at once, each layer has to be sanded after curing.Should I be using poly resin or a combination of poly and epoxy in different locations?
Yes, a quick fix, if dougd plans to practice fiberglass repair skills, and then to sell this Sunfish. While this repair could be dismissed as "minor", the bow takes a beating on most sailboats. (Even those with reverse!)That was a minor repair, a couple layers of glass, dry time. Some marine tex after the glass. Some sanding with a block and you would have the bow shaped back to original. Splitting just adds another variable. No need to mold.
Now that dougd has "popped the hood", what grade of sandpaper is recommended for roughing-up the coarse roving cloth within? Sandblasting would be my choice on such a coarse weave—especially, as I have the equipment—but sandblasting is messy.What I was trying do was give dougd a easy fix by going on the inside and not having to try to level/hide a three layer patch that sits above the surface on the outside of the
damaged area.
Go out to the woodshed and be prepared to be whipped!! :-D.........or Bondo?
(!) I never thought to mix Dyna-Glass with Bondo.Short strand filler like Dyna-Glass would be good for areas
subject to impact. Should double your filler strength.
Before I finish whipping you for your Bondo remarks, here on a boating forum.... although Bondo "tries" to advertise itself as being waterproof... Good luck. It'll absorb water and do things, making you wished you'd never ever heard of the stuff.A body shop video contrasted Dyna-Glass to Bondo—Dyna-Glass being better—more flexible, less tendency to crack at seams.
Go out to the woodshed and be prepared to be whipped!! :-D