Stringer question

[Medic4040]

If i wanted to put new stringers into the boat, how would I go about attaching them to the hull? DO I fiberglass them right to the hull? And what type of wood should the stringers be?

 

[SuzukiChopper]

Re: Stringer question

You should generally bed them in something before any glassing is done. I personally used PL premium on mine but you can mix up a peanut butter mixture as well. The idea is that you don't want the wood directly on the hull to minimize any wear if they start moving. Once they are in place, then you glass them to the hull. Of course they should be sealed up with resin to begin with and fully wrapped with glass. You can probably just get away with sealing the underside and up the sides a little as once you encase them with cloth and resin, they'll be fully sealed. The ultimate in my mind is using penetrating epoxy or thinned out poly resin and letting the stringers soak first. If you go the epoxy route, stay with epoxy throughout the entire build.

Check out the hull extension oops! is doing and you'll see a lot of advice there...

http://forums.iboats.com/showthread.php?t=234392

 

[erikgreen]

Re: Stringer question

I don't have too much to add to that.

The advice on keeping ply stringers off the hull is sound, you want to typically space the stringer off the hull with putty or poly adhesive. Use a 1/8 or so piece of plastic or wood to hold the gap while things harden, or better yet a small foam piece.

You should coat the entire stringer with epoxy. Penetrating epoxy is not something I'll probably use myself, unless someone can show that it protects better than the full strength stuff.

Most builders/repairers tab the stringers to the deck with 2 layers of 12 to 17 ounce glass, either roving or biaxial. Use mat-glass-mat-glass if you're using poly resin, and make sure the hull is very clean and ground down first.

Post pics here when you do this stuff and we'll comment

Erik

 

[Medic4040]

Re: Stringer question

thanks for ur input guys!

 

[Medic4040]

Re: Stringer question

actually as a follow up question, what grit sand paper should I be using on the hull to clean it up so that i can get things to stick when I am read to put down new stringers?

 

[Bondo]

Re: Stringer question

Ayuh,... 40gr. to 80gr. will clean it Quickly,+ leave a good surface for the new to bite onto....