| View previous topic :: View next topic |
| Author |
Message |
wailedcentipede
Joined: 13 Dec 2003
Posts: 199
City/Region: canada
State or Province: BC
Vessel Name: Blue Jay
|
 Posted: Sun Jan 01, 2006 7:21 pm Post subject: |
 |
|
your first application was the fiberglass ...
your second application was the gel coat ...
would the first application not have to cure for 30 days???
their may be a reaction between the two applications ...
the first is still giving off solvents ...
different systems have spacific recoat times
if nothing else you have everyone guessing .. lol |
|
| Back to top |
|
 |
Sea Wolf
Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
|
| Posted: Sun Jan 01, 2006 8:56 pm Post subject: |
|
|
Steve-
I've just done some reading on this topic, and, in general, applying polyester gel coat over epoxy is not recommended.
The polyester gel coat won't set up properly on epoxies especially where unused epoxy catalyist provides amines which interfere with the polyester bonding to the epoxy and the polyester hardening itself.
To properly apply a polyester gel coat to an epoxy resin, the surface must be sanded to remove any wax and amines, washed with solvents, and allowed to breathe in the air. Then a "tying coat" of epoxy paint is recommended, followed by sanding again and then the application of the polyester gel coat.
But some gel coat manufacturers don't recommend it, period.
Here's a couple of links where some of this is discussed:
http://www.epoxyworks.com/22/polyester.html
http://www.systemthree.com/faqs.asp
Enjoy! Joe.
_________________
Sea Wolf, C-Brat #31
Lake Shasta, California
  
"Most of my money I spent on boats and women. The rest I squandered'. " -Annonymous |
|
| Back to top |
|
|
dogon dory
Joined: 10 Jun 2004
Posts: 1321
State or Province: AK
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: DogOnDory
|
| Posted: Sun Jan 01, 2006 9:17 pm Post subject: |
|
|
Sorry, Folks - Post Deleted By Author
Last edited by dogon dory on Mon Mar 03, 2008 9:58 am; edited 1 time in total |
|
| Back to top |
|
|
SeaSpray
Joined: 12 Mar 2004
Posts: 1007
City/Region: Brentwood, CA
State or Province: CA
C-Dory Year: 2004
C-Dory Model: 22 Cruiser
Vessel Name: SeaSpray
Photos: SeaSpray
|
| Posted: Mon Jan 02, 2006 12:37 am Post subject: |
|
|
Well there you go! My friend that helped me with this has worked with epoxy a far bit but probably not the gelcoat. Wish I had known this before.
Since I want to get the boat back together I will leave it as it is and see if the gelcoat will harden further. Basically it is sound, it's just a matter of if water could eventually penetrate the wood cleats.
Thanks for the research.
Steve |
|
| Back to top |
|
|
dogon dory
Joined: 10 Jun 2004
Posts: 1321
State or Province: AK
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: DogOnDory
|
| Posted: Mon Jan 02, 2006 12:44 am Post subject: |
|
|
Sorry, Folks - Post Deleted By Author
Last edited by dogon dory on Mon Mar 03, 2008 9:58 am; edited 1 time in total |
|
| Back to top |
|
|
Sea Wolf
Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
|
|
| Back to top |
|
|
AstoriaDave
Joined: 31 Oct 2005
Posts: 994
City/Region: Astoria
State or Province: OR
|
| Posted: Mon Jan 02, 2006 1:09 am Post subject: |
|
|
| seabran wrote: | | I don't understand what the difference is. It does seem that the gelcoat has a harder time setting up when it is applied over epoxy and glass versus the vinylester and glass. The gelcoat that is just on the original part of the boat is hard as nails. |
Oh, man! I did not pick up on this in your earlier posts ... polyester resin will not set up if applied over epoxy, unless you lay down a barrier coat first. No wonder this was not working. They have the product you need at the marine supply store (or, they should). West Marine has it for sure.
Wish I had picked up on this in the beginning -- could have saved you some work and hassle. Sorry about that.
_________________
Dave Kruger
Astoria, OR |
|
| Back to top |
|
|
|
Search
Private Messages
Profile
Log in
Register
Help
