glass on questions

General Discussion
1

OK. – I foil a pair of book matched poly keels for a mini-simmons type board that is stringerless EPS with a progressive hull type bottom. The board get colored with a baste coat resin and laminated with clear all Epoxy of course. I foil the fins so there is about 2 layers at the trailing edge and do my final sanding with 120 grit so the poly will have some teeth for the epoxy to get a mechanical bond with. The fins are slightly undercambered and foiled from a 28 layer 6oz. panel. When the fins are glassed on naturally the roving goes a little milky which is to be expected with epoxy and in order to give the glass-on marriage good strength a couple layers of 6oz. is run up either side of the fin, which is as I understand it standard glass on practice. Well these layers of 6oz. naturally have to be refoiled so the trailing edge isn’t too wide.Is this the way it’s supposed to be or is there a better way to do it. I don’t like taking fins to the glass man and having him work me on my finished foil cause it’s not up to snuff. The idea is to meet the highest standards possible.

So, Should I foil trailing edges down to a knife edge?

Any suggestions from the many experienced glass men here will be greatly appreciated. The last thing I want to do is may work for the glass man. (Glass and sand a board sometime and you’ll know how much work it is) Hell Glass-on fins are hard enough with out complicating things.

Whatdayasay ~ Herb? Kokua? Jim The Genius? The pros at Sways?

Aloha, Rich

2

…hello,

yes, will be good but not 100% necessary

-after you glue the fin on the lam of the bottom, put the roving strands and 3 x 4 oz per side in crossed style instead of 2 x 6 oz (but go with this if you want); trim excess

after the hot coat, sand the rough of the roving in front and back of the edges of the fins with 36 grit in hard pad

change the pad, grit and sand the hot coat of the fins

there you ll sand and refine the trailing edges to the final desired shape

then apply the gloss coat

3

Yo Reverb,

Thanx!

With Epoxy could one grind out all the details and apply a coat over that and do the finish sanding a polish on that thus eliminating the second fill coat?

Hmmmm.

No Worries, Rich

4

If I understand corretly, you’re wanting to rough sand the fins pre filler coat. You can do that, but it requires the resin to set up enough to sand. When I glass on fins, I fill coat right after I trim the glass. I’d say rough out the whole bottom of the board and the fins then fill coat. You can then sand it with really fine grit. Be sure and use plenty of Additive F to avoid fisheyes.

5

…in my opinion the hcoat/filler coat is just for this purpose: fill

then a final coat is just for other intention: finish

so you can apply resin or clear coat

but, yes, you can do that but more stress in the work to avoid burnouts