Folding Kayaks Forum

The user forum for FoldingKayaks.org
It is currently Fri Dec 06, 2019 12:05 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: Chipped Coaming.
PostPosted: Sat Dec 22, 2018 1:38 am 
recent arrival

Joined: Thu Dec 13, 2018 7:56 pm
Posts: 4
My 2003 Big Kahuna has about 3 inches chipped off outer back edge. As much as half an inch broken off. I want to build it up with fiberglass. Should I use Epoxy Resin of Polyester Resin?

Has anyone done this?


Top
 Profile  
 
 Post subject: Re: Chipped Coaming.
PostPosted: Sat Dec 29, 2018 5:55 pm 
forum fan

Joined: Wed Mar 28, 2018 6:05 am
Posts: 11
I worked with epoxy and fiberglass ned on coaming of older K1 from 98 and it worked. Work outside because of the smells. Good luck!


Top
 Profile  
 
 Post subject: Re: Chipped Coaming.
PostPosted: Sat Dec 29, 2018 7:18 pm 
recent arrival

Joined: Thu Dec 13, 2018 7:56 pm
Posts: 4
That's epoxy resin (2 parts mixed 1 to 1), right? Not the polyester resin (comes in one large container & you add a few drops of "Hardener" and mix) right?

Thinking about running fiberglass cloth all the way around as reinforcement. Is that a good idea?

2003 vintage. Coaming seems kinda brittle. Adding a lamination of glass with cloth would strengthen, but also make thicker.

Waiting for warmer weather. Cures quicker.


Top
 Profile  
 
 Post subject: Re: Chipped Coaming.
PostPosted: Sun Dec 30, 2018 7:41 pm 
forum fan

Joined: Wed Mar 28, 2018 6:05 am
Posts: 11
I had the epoxy resin with hardener here in Germany.

https://www.ebay.de/itm/46-39-Kg-R-G-28 ... 2366781108


Quiet difficult to measure, use some cheap injection thing without needle from the farmacy.

Used one which started to harden at 30 or 40 minutes. Thats possible to work with.

I put glass around the coaming from the inside and outside, one layer. And under the "lip". Adds weight but also stability. Those coaming are no longer made, so better protect them. After that you can polish it with sand paper and paint it with some black water resistant colour.

Good luck!


Top
 Profile  
 
 Post subject: Re: Chipped Coaming.
PostPosted: Mon Dec 31, 2018 12:05 am 
recent arrival

Joined: Thu Dec 13, 2018 7:56 pm
Posts: 4
Thanks for the info. I'll be working outside, so I need warmer temperatures for quicker curing. I've used polyester resin with & without cloth on old planked wooden decks & on plywood hulls. Polyester is much less expensive. Not as strong.

Feathercraft site says: "large fibreglass coaming ... is no longer made. If a coaming has broken, best to do a repair with an epoxy or fibreglass."

And epoxy definitely affords better adhesion. Though more expensive. And can't finish epoxy with gelcoat.

I think you can actually put color/dye directly in the resin.

Looking at using something like this:

https://www.amazon.com/dp/B00HR8517A/re ... 19e6f8bfdd

And I think your method of sandwiching the original Coaming with cloth & resin is the way to go.

Finished Coaming would be stronger than the original.


Top
 Profile  
 
 Post subject: Re: Chipped Coaming.
PostPosted: Sat Feb 02, 2019 5:30 pm 
forum fan

Joined: Sat Oct 27, 2018 2:40 am
Posts: 20
I used to have a boat constructed of fiberglass over plywood. I had to make repairs from time to time.. Epoxy was by far the better choice. Easier to work, much stronger and less brittle.

Epoxy can be messy to work with and once cured it is pretty tough so it requires a lot of strong sanding to smooth out.

A trick for making smooth surfaces is to use micro balloons. Add them to an epoxy mix base and it smooths out easily and can be applied with a putty knife. Once dry, it sands easily to a smooth and level surface.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group