Inexpensive glue instead of epoxy?

Post your own building tips and "how to" ideas here.
User avatar
jem
Site Admin
Posts: 4864
Joined: Fri Jun 18, 2004 8:14 pm
Type of boat I like: Wooden
Location: Greensboro, NC
Contact:

Re: Inexpensive glue instead of epoxy?

Post by jem » Thu Jan 01, 2009 10:35 am

tx river rat wrote:I didnt say nothing mister Matt
Ron
The art of speaking volumes without saying a word. :lol:
-Matt. Designer.

User avatar
hairymick
Design Reviewer
Posts: 1965
Joined: Wed Jan 04, 2006 8:54 am
Type of boat I like: <-- Please read instructions to the left and delete this text. Then, tell us what type boat you like! :-)
Location: Queensland, Australia
Contact:

Re: Inexpensive glue instead of epoxy?

Post by hairymick » Thu Jan 01, 2009 3:18 pm

Need mo 'poxy,Need mo 'poxy,Need mo 'poxy,Need mo 'poxy, :P
Regards,
Mick

JEMWATERCRAFT Swampgirl; Wadefish;Touring Pirogue;South Wind; P5 ;
Laker X 2, Sasquatch 16.5 T-V 15 Okwata 15:
Cobia 15 (under construction)

Workin Man
Posts: 7
Joined: Tue Apr 22, 2008 6:39 pm
Type of boat I like: <-- Please read instructions to the left and delete this text. Then, tell us what type boat you like! :-)
Location: Coldwater, Ontario, Canada (formerly Guelph)

Re: Inexpensive glue instead of epoxy?

Post by Workin Man » Sun Jan 04, 2009 11:12 am

Graham wrote:You know i always try to find a topic that causes some controversy. Has anyone had any experiences with polyurethane adhesives not as a replacement for epoxy just as a waterproof adhesive?.
oh and happy new year to all.
I have a small (8') home built jonboat that I used PL premium adhesive on. It is not a true stitch and glue boat though, it is built using chine logs. I applied a good bead of the adhesive to the logs before installing them. The transom was also installed with the same glue. I had to replace the transom this past summer (after 7 years including being stored outdoors in the winter), there was no sign of the adhesive failing. The entire boat is epoxy coated inside and out however, with 6oz glass on the outside of the hull, so there was no possibility of moisture getting to the glue. I'm not sure how it would have fared if it had been exposed to moisture, particularly over the winter. I did use epoxy to install the new transom though.

I'm sure most of you are wondering why the transom needed replacing on a 7yr old boat. The original was made of white pine biscuit jointed together, then epoxy sealed. The stress applied to it by the motor was causing it to crack along the grain of the wood. The new transom is marine ply instead.

Jim

User avatar
Kayak Jack
Design Reviewer
Posts: 1186
Joined: Sun Jun 20, 2004 8:03 pm
Type of boat I like: <-- Please read instructions to the left and delete this text. Then, tell us what type boat you like! :-)
Location: South-central Michigan

Re: Inexpensive glue instead of epoxy?

Post by Kayak Jack » Sun Jan 04, 2009 1:22 pm

When I was a kid, during WWII, Dad made boats using marine plywood, framing, and Rogers' Fish Glue. Lots of brass screws too. He would then use Water Lox varnish to cover them. I don't remember any of them ever separating. No glass or epoxy.

They can be a lot lighter now with thinner wood, fiber glass, & epoxy.
Kayak Jack
Doing what you like is FREEDOM
Liking what you do is HAPPINESS
I spent most of my money on whiskey and women - and I'm afraid I just wasted the rest.

Oldtimer
Posts: 5
Joined: Wed Nov 24, 2010 1:27 pm
Type of boat I like: Okwata

Re: Inexpensive glue instead of epoxy?

Post by Oldtimer » Wed Dec 01, 2010 1:56 pm

Moisture curing polyurethane glue when used properly gives joints stronger than the wood or the glue that holds the plies of multiplex together.

1) It is NOT as strongly gapfilling like thickened epoxy.
2) It fills gaps with foam of no strenght.
3) So the joint has to fit perfectly.
4) Rub the glue on both surfaces of the joint.
5) Wait and see the glue penetrating the wood (darker coloring).
6) Wait further till the clear glue gets a somewhat milky appearence . (moisture out of the air and wood has started the foaming and hardening)
7) Clamp the surfaces tightly together.

So I made the scarfs for the gunwales of my canoe and fastened them in place

Koos

Post Reply