Creased Kevlar Board

Recently took my 9’2" out in some good waves. Came in with a creased deck. Now, the bottom is glass kevlar glass and the top glass kevlar glass glass. I know kevlar is strong in tension and poor in compression and the photos support this as the bottom is undamaged.

Question is what’s a good repair strategy? Increase deck compression stiffness? Increase bottom tensile stiffness. Use more glass, some unidirectional carbon… I’ve got access to the lot BUT WHAT DO YOU THINK?? I know sanding kevlar is almost impossible but I can solve that!

Photos available here: http://www.photobox.co.uk/album/4093021 view as slide show

Seems you were out in that big surf last week…

Have you thought about rail bands…? Will make the board stiffer for sure.

Increase deck compression stiffness (carbon?), the bottom is solid enough! Or make a sandwich deck maybe.

If you could go inside that crease, youll likely find foam attached to the glass. You could make holes along the crease and fill it with foaming pu adhesive (Gorilla, etc), and press the crease back down while it cures. But youll need to paint if cosmetics is important to you. Or, cut/peel off the creased glass, fill foam void with pu adhesive and reglass.

If youre concerned about recreasing the board, you’ll need to reinforce (stiffen) your glass, both sides with some light cloth. Or route a long slot and place in a wood stringer…many ways to skin da cat.

www.boardlady.com

has some excellent repair info with pics…check her out

I’ve done the cutting and grinding and posted more pics on original post link. Have filled the grooves with epoxy and low density filler. Will sand all fair tomorrow and maybe begin adding glass and carbon, a bit of flax (have you seen the properties of flax/epoxy composites? Awsome), maybe a few pig bristles from my brush and anything else that will help.

More to follow

a bit of flax (have you seen the properties of flax/epoxy composites? Awsome), maybe a few pig bristles from my brush and anything else that will help.

Now your talkin!

Flax? Isnt that a seed thats really good for you to eat?

I got a name for your board…OMEGA.

I know nothing about this trick but its quite the brain candy.

:wink:

Quote:

have you seen the properties of flax/epoxy composites? Awsome

Flax, hemp, ramie, sisal - you name it. This is a (poor) pic of an epoxy fish with flax deckpad (foam on the left - flax on the right) i´m about to finish…

So what is the rest of the layup?

I have a student who is beginning a small research project on Bio resins (and hopefully bio fibres). Be neat to make a bio board as a test bed.

What else have you done with these fibres??

Cheers

The rest is 6 oz. glass, I used only a 3/4 deckpad, around 6 oz. flax. I didn´t want to add too much weight, since the flax soaked up lots of resin. Prior to this, I built a skateboard with flax (see http://www.swaylocks.com/forum/gforum.cgi?do=post_view_flat;post=276270;page=1;sb=post_latest_reply;so=ASC;mh=25;guest=6344408).

The biggest problems I see with natural fibers are to find an appropriate weave style (i.e. unidirectional etc.) and to make them bond to resin (washing the cloth…). There is a company in the Uk (oceangreen.com??) that does full-hemp boards, maybe they are worth to check out.