Boat Building Forum

Find advice on all aspects of building your own kayak, canoe or any lightweight boats

Re: Epoxy: Edge delamination
By:JohnK
Date: 8/14/2008, 5:04 am
In Response To: Epoxy: Edge delamination (Glen Gray)

Ok, I think I understand better now. You pre-coated the wood with epoxy and then glassed over that layer when hard. Did you glass over it in the time when you could still get a chemical bond, or did you wait too long for that? If you did you could have trouble with amine blush having formed on the pre-coat, which would definitely weaken the bond and yes you could get delamination.

If you are certain that amine blush is the problem, and that delamiantion is going to happen, then I would strip back the glass and redo it. The following is all hearsay as I've not had to do it :-), but proceed as follows: Heat the fibreglass with a heat gun and peel it back. It will soften sufficiently to do that. Begin at one end and work to the other. Then you have to smooth the surface without sanding through the epoxy coating into the wood. Then wash it with hot water to get rid of any residual amine blush. Some add ammonia or detergent to the water, but its not needed. You could smooth and wash together with hot water and a scotchbrite pad, but don't go through to bare wood else it will all get blotchy, not only from water, but also from the later epoxy coat. Then reglass.
JohnK

: I have just finished glassing & sanding the deck on my Storm LT & was
: getting ready to cut the cockpit after I trimmed the glass etc from the
: sheer line.
: It has been almost 6 weeks from when I first put masking tape around the
: sheer line. When I trimmed off the fibreglass & tape with a sharp
: blade there was a bit of chipping of the epoxy & it was a bit tough to
: cut through because of the time it had been there, but I succeeded
: eventually, no major hassles really.
: My main concern is that after stripping away all the tape etc, the cut edges
: delaminated in several places, it seems to be between the glass & the
: first coat of epoxy on the timber. I can delaminate these cut edges with
: my fingernail without too much trouble & I don't know how much more
: would lift if I kept pulling, I fully suspect quite a bit.
: I could ignore it & hold it all together with the glass tape when I join
: the hull & deck but I'm afraid that's just a band-aid & any sort
: of knock will cause delamination anywhere on the deck & I would then
: have to strip & re-glass the "finished" kayak.
: Is it better if I strip off all this glass back to the bare timber now &
: start again or am I panicking over nothing. I have already resigned myself
: to this task if necessary.
: I'm sure this forum is littered with similar tales of woe so I'd love to hear
: from the hundreds of years of collective experience out there as to my
: next move.

: Thank you for any advice
: Glen G.

Messages In This Thread

Epoxy: Edge delamination
Glen Gray -- 8/13/2008, 4:13 am
Re: Epoxy: Edge delamination
Glen Gray -- 8/16/2008, 9:21 am
Re: Epoxy: Edge delamination
JohnK -- 8/16/2008, 5:00 pm
Re: Epoxy: Edge delamination
JohnK -- 8/14/2008, 5:04 am
Re: Epoxy: Edge delamination
Brian Nystrom -- 8/14/2008, 8:11 am
Re: Epoxy: Edge delamination
JohnK -- 8/14/2008, 6:29 pm
Another option is...
Brian Nystrom -- 8/15/2008, 7:30 am
Re: Another option is...
Glen Gray -- 8/15/2008, 6:24 pm
Re: Epoxy: Edge delamination
JohnK -- 8/13/2008, 7:52 pm
Re: Epoxy: Edge delamination *Pic*
Glen Gray -- 8/14/2008, 3:48 am
Re: Epoxy: Edge delamination
Glen Gray -- 8/14/2008, 6:59 am
Re: Epoxy: Edge delamination *Pic*
Glen Gray -- 8/14/2008, 7:19 am
Re: Epoxy: Edge delamination *Pic*
Glen Gray -- 8/14/2008, 7:22 am
Re: Epoxy: Edge delamination
Bill Hamm -- 8/16/2008, 1:44 am
Re: Epoxy: Edge delamination
JohnK -- 8/14/2008, 6:22 pm