Reply
 
Thread Tools Search this Thread
 
Old 18 June 2006, 07:12   #1
Member
 
Country: UK - Scotland
Town: Borders
Boat name: Pacific 22
Length: 6m +
Engine: Mermaid diesel
Join Date: Sep 2005
Posts: 38
Epoxy / fibreglaas question

Help! I have primed some plywood with SP epoxy, then given it a few layers of glass mat with standard polyester resin. The stuff on top (grp) has cured ok, but it looks like the layer that was next to the epoxy is still goo. Does anyone know if newish epoxy will react with the polyester resin (maybe the styrene?) I am wondering if I should get the grinder out now and remove it or give it more time to go off. Any advice from experienced boat builders / laminators would go down a treat! Thanks Jack
__________________

__________________
jackcastoff is offline   Reply With Quote
Old 18 June 2006, 10:37   #2
Gav
Member
 
Country: UK - England
Town: Midlands
Length: 6m +
Join Date: Mar 2005
Posts: 80
you should really have left the epoxy to fully cure before applying polyester.
__________________

__________________
Gav is offline   Reply With Quote
Old 18 June 2006, 23:27   #3
Member
 
Country: USA
Town: Ventura, California
Boat name: Maverick
Make: Ribcraft Mitigator
Length: 7m +
Engine: 2 150 hp Johnsons
Join Date: Feb 2006
Posts: 73
I'm no expert but I have always been told that you can apply epoxy over polyester but not polyester over epoxy. I've also heard that if you sand the epoxy well, the polyester will adhere but I have also heard of many failed atempts. If there are no experts out there I will try to get more info and do another post.
__________________
Channel Watch Marine, Inc.
Vessel Assist Ventura
www.channelwatchmarine.com
Channelwatch is offline   Reply With Quote
Old 19 June 2006, 07:22   #4
Member
 
Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
Join Date: Apr 2006
Posts: 398
start over. use an additive to help stick to the wood.
__________________
fast fred is offline   Reply With Quote
Old 19 June 2006, 08:52   #5
Member
 
Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
Quote:
Originally Posted by Channelwatch
. If there are no experts out there I will try to get more info and do another post.
the post above yours was from an expert, but he's a hardboater so can he be trusted that's the question?
__________________
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo
Rogue Wave is offline   Reply With Quote
Old 19 June 2006, 08:53   #6
Member
 
Country: UK - England
Town: Farnborough
Boat name: Eleven
Make: Arrow
Length: 8m +
Engine: 557cu, 700hp
Join Date: Jul 2003
Posts: 1,255
A norvern hardboater of all things!
__________________
Matt is offline   Reply With Quote
Old 20 June 2006, 13:58   #7
Member
 
Country: USA
Town: Ventura, California
Boat name: Maverick
Make: Ribcraft Mitigator
Length: 7m +
Engine: 2 150 hp Johnsons
Join Date: Feb 2006
Posts: 73
Quote:
Originally Posted by Channelwatch
. If there are no experts out there I will try to get more info and do another post.

Quote:
Originally Posted by Rogue Wave
the post above yours was from an expert, but he's a hardboater so can he be trusted that's the question?
Well, our fleet consists of both hard and soft boats so I would be inclined to at least 1/2 trust his advice. So is there any truth to "its ok to use epoxy over polyester but not polyester over epoxy"? Any tricks, other than letting the epoxy fully cure, to getting polyester to adhere to epoxy?
__________________
Channel Watch Marine, Inc.
Vessel Assist Ventura
www.channelwatchmarine.com
Channelwatch is offline   Reply With Quote
Old 20 June 2006, 14:11   #8
Gav
Member
 
Country: UK - England
Town: Midlands
Length: 6m +
Join Date: Mar 2005
Posts: 80
Quote:
Originally Posted by Channelwatch
Quote:
Originally Posted by Channelwatch
. If there are no experts out there I will try to get more info and do another post.



Well, our fleet consists of both hard and soft boats so I would be inclined to at least 1/2 trust his advice. So is there any truth to "its ok to use epoxy over polyester but not polyester over epoxy"? Any tricks, other than letting the epoxy fully cure, to getting polyester to adhere to epoxy?

i have heard the saying........ but .... its not correct! however epoxy needs to be fully cured and keyed before applying polyester. the difference between the two i can only imagine is the amount of shrinkage with polyester over zero shrinkage with epoxy.....
__________________

__________________
Gav is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 11:22.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.