Two specific questions relating to delam repairs??

Hi all,

All the delam repair advice and tips provided on this site (as given by Mat Miller and others) is a terrific resource to all hobie owners everywhere. So I'd like to ask two specific questions here.

First,
What kind of foam was used in the construction of older Hobie 16's? In other words..precisely what kind of plastic polymer (eg polyurethane, polystyrene, polyethylene...) is the foam layer sandwiched between the two fiberglass layers?

And also,
Does anyone have any knowledge or experience with a product called CPES as offered by an online outfit called [rotdoctor.com] ? The makers of CPES claim it is much superior to Git Rot because it has far better penetration qualities.

CPES appears to be essentially the same kind of epoxy product as Git Rot (which is designed primarily for penetrating and solidifying rotted wood fibers). The only difference I can see between them is that CPES claims to provide a significantly better 'penetration index’ over the several other similar products of this type. If this product's wood-fiber penetration
performance is truly superior to Git Rot, then it would seem to be a sensible (if not better) option for the purpose of delam repairs on a Hobie.
So I'm wondering if anyone here has had any experience with CPES?

Thanks to all..
& happy sailing!

I believe the foam was PVC.

The foam is sandwiched between the two layers of glass. Therefore the term foam sandwich.

_________________
Matt Miller
Former - Director of Parts and Accessory Sales
Warranty and Technical Support
Hobie Cat USA
(Retired 11/7/2022)

I have followed the previous post of mmiller on the use of Git Rot for repairing a hull delam. My case is almost "textbook" in that it was exactly described with the sample provided from the FAQ post, ie delam right in front of the front pylons.

I am interested in what I should have encountered and if what I found is typical. I used Git Rot and injected into the delam area. I found the product to easily run out of the air holes. Because there is some slope to the deck when I put more of the epoxy in it ran out of the lower portion of the soft spot. Therefore I taped over the holes and filled the delam area about half full. I figured I would let the product set up and then do the top half.

The next morning I found the entire cavity to be empty. The Git Rot had either gone into the foam or disolved the foam but the entire delam area was empty. Is this normal? (I do not think it leaked into the hull)

I am hoping that the epoxy has now sealed up the foam so when I put more in it will "stay put".

Can anyone tell me where the Git Rot went and if my plan that the previous material injected has hardened and will prevent it from continiuing to penetrate with the next application.

Leaking out.

There may be a crack in the underside (inside glass layer) that allowed the resin to leak out...or one of the breather holes pierced the inner glass layer.

Absolutely you need to plug the breathers as the resin flows to each one. That is part of the procedure.

_________________
Matt Miller
Former - Director of Parts and Accessory Sales
Warranty and Technical Support
Hobie Cat USA
(Retired 11/7/2022)