Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rating: Thread Rating: 4 votes, 2.75 average. Display Modes
Old 15-11-2006, 14:00   #16
Registered User
 
seafox's Avatar

Join Date: Jul 2005
Location: new zealand
Boat: Lotus 10.6
Posts: 1,270
Images: 26
It was a small repair on a trailer sailer and I used car bog!
__________________

__________________
seafox is offline   Reply With Quote
Old 15-11-2006, 21:56   #17
Registered User
 
seafox's Avatar

Join Date: Jul 2005
Location: new zealand
Boat: Lotus 10.6
Posts: 1,270
Images: 26
Saw some boat builders using it and thought it would be ok. I got some shrinkage after I had painted it and got a hairline crack around the extremeties of the repair.
__________________

__________________
seafox is offline   Reply With Quote
Old 15-11-2006, 22:45   #18
Senior Cruiser
 
Alan Wheeler's Avatar

Cruisers Forum Supporter

Join Date: Dec 2003
Location: Marlborough Sounds. New Zealand
Boat: Hartley Tahitian 45ft. Leisure Lady
Posts: 8,038
Images: 102
Yep that is what you use and it shouldn't have shrunk. It must have been some cheap stuff perhaps. However, if the surface was subject to flex, it may crack. There are Bogs available that have glass fibre in them which helps with strength and flex and preperation of the edge with styrene liquid is recomended. It disolves the surface of the old Polyester and results in a better bond.
__________________
Wheels

For God so loved the world..........He didn't send a committee.
Alan Wheeler is offline   Reply With Quote
Old 16-11-2006, 13:43   #19
Registered User
 
seafox's Avatar

Join Date: Jul 2005
Location: new zealand
Boat: Lotus 10.6
Posts: 1,270
Images: 26
I went to a Resenes boat painting evening a few months back at Lowry Bay Yacht Club and the technical person there (from Resenese) told everyone to use expoxy for repairs and mentioned that the bog shrinks. Said that boat builders use it because it drys quickly compared to epoxy and you can paint over it quickly. Reckons it fails all the time.
__________________
seafox is offline   Reply With Quote
Old 23-11-2006, 15:40   #20
cruiser

Join Date: Mar 2004
Posts: 1,167
epoxy and gell coat

Epoxy sticks well to gel coat. gelcoat or any polyester doesn't stick to epoxy. About the only thing that sticks to epoxy is epoxy, wet on wet, within 48 hours of the last coat, or if the epoxy drys too long , then it has to be sanded between coats.
Brent
__________________
Brent Swain is offline   Reply With Quote
Old 24-11-2006, 03:25   #21
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,580
Images: 240
Brent:
You seem to have fallen prey to the common misconception that gelcoat will not bond to epoxy. - gelcoat can bond to epoxy

I suggest you check the literature, theres more documentation than the (2) WEST System articles, cited in the original post.
Im particularly distressed when, otherwise knowledgeable people of reputation (such as you), post un-substantiated and inaccurate opinions (as fact).
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 24-11-2006, 03:40   #22
Registered User
 
cat man do's Avatar

Join Date: Aug 2006
Location: Brisbane Australia [until the boats launched]
Boat: 50ft powercat, light,long and low powered
Posts: 4,409
Images: 36
I would have thought that polyester gelcoat would stick to epoxy, like polyester resin sticks to timber.

With limited success.

Dave
__________________
"Money can't buy you happiness but it can buy you a yacht large enough to pull up right alongside it"...............David Lee Roth
Long Distance Motorboat Cruising It Is Possible on a Small Budget
cat man do is offline   Reply With Quote
Old 03-12-2006, 23:59   #23
Registered User
 
seafox's Avatar

Join Date: Jul 2005
Location: new zealand
Boat: Lotus 10.6
Posts: 1,270
Images: 26
From the www.epoxyglue.com site: "You cannot use auto filler (polyester bog) on your boat. You may experience adhesion problems on a flexing hull. You will have little protection if water gets to it. Heard of osmosis? There could be shrinkage problems. There could be shadowing with un-reacted styrene monomer, a solvent in polyester bog, reacting with the top coat. EPOXYBOG, our name for epoxy fairing compound, eliminates these problems. The secret is in using epoxy resin as the base. Epoxy reacts with, in this case, an amine hardener, to form a densely cross-linked polymer with exceptional adhesion and strength. It is a pre-filled, trowelable, epoxy putty, that feathers out and sands easily. It is very strong because it chemically cross-links to cure. Adhesion to a properly prepared substrate is exceptional.
EPOXYBOG, an Xtra lite, and creamy low density trade epoxy."
__________________

__________________
seafox is offline   Reply With Quote
Reply

Tags
epoxy, gelcoat

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gelcoat crazing Connemara Construction, Maintenance & Refit 5 30-10-2006 23:22
how to treat old anti skid? lancs Construction, Maintenance & Refit 7 08-10-2006 16:55
epoxy shrinkage northerncat Construction, Maintenance & Refit 1 17-09-2006 02:44
Cheesy Epoxy Boracay Construction, Maintenance & Refit 10 31-08-2006 13:19
GELCOAT CRAZING (Part 1) GordMay Construction, Maintenance & Refit 5 24-05-2004 17:55



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:59.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.