Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 19-05-2007, 08:57   #1
Registered User
 
markpj23's Avatar

Join Date: Nov 2005
Location: Black Hills, SD
Boat: Now Boatless
Posts: 1,148
Images: 47
Gelcoat Repair Reference(s)

Lots of choices out there for instruction books on gelcoat repair. I have some stress cracks and the like topsides that I want to address.

Any "must have" reference books / manuals you can recommend? My experience / skill level is 'novice' in this category...

__________________

__________________
Mark
markpj23 is offline   Reply With Quote
Old 19-05-2007, 09:45   #2
Registered User
 
Terra Nova's Avatar

Join Date: Apr 2007
Location: Marina del Rey, California
Boat: Freya 39 cutter- Terra Nova
Posts: 3,645
Quote:
Originally Posted by markpj23
Lots of choices out there for instruction books on gelcoat repair. I have some stress cracks and the like topsides that I want to address.
Yo Mark,

when repairing stress cracks it is important to grind away all the gelcoat down to the fiberglass, and apply mat/resin prior to re-gelcoating, or the cracks will reappear. Leave the matted area a little low to allow for the thickness of the new gelcoat.

best, andy
__________________

__________________
1st rule of yachting: When a collision is unavoidable, aim for something cheap.
"whatever spare parts you bring, you'll never need"--goboatingnow
"Id rather drown than have computers take over my life."--d design
Terra Nova is offline   Reply With Quote
Old 19-05-2007, 10:47   #3
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Quote:
Originally Posted by Terra Nova
Yo Mark,

when repairing stress cracks it is important to grind away all the gelcoat down to the fiberglass, and apply mat/resin prior to re-gelcoating, or the cracks will reappear. Leave the matted area a little low to allow for the thickness of the new gelcoat.

best, andy
This all depends on the cause for the stress areas. A lot of the time one needs to reinforce the UNDER SIDE. One example would be the corners of a cockpit area. If the deck is not supported properly the deck flexes causing the cracks. And they just come back if the original problem is not fixed.

Other places include; the outside corners of the cabin. around stantions, around chainplates, winches, cleats, mast tabernackle/base, pedistals and so on.

Good old boat is a good start but here's a couple more:

http://www.greatwhiteboatco.com/

http://www.tracycommunications.com/g...tm/gelcoat.htm
__________________
delmarrey is offline   Reply With Quote
Old 19-05-2007, 11:47   #4
Registered User
 
Terra Nova's Avatar

Join Date: Apr 2007
Location: Marina del Rey, California
Boat: Freya 39 cutter- Terra Nova
Posts: 3,645
Quote:
Originally Posted by delmarrey
This all depends on the cause for the stress areas. A lot of the time one needs to reinforce the UNDER SIDE. One example would be the corners of a cockpit area. If the deck is not supported properly the deck flexes causing the cracks. And they just come back if the original problem is not fixed.

Other places include; the outside corners of the cabin. around stantions, around chainplates, winches, cleats, mast tabernackle/base, pedistals and so on.
Yo Del,

good post and a great point to bring up! That the reason for the stress crack is STRESS. Sometimes the design of stanchion bases for example focuses the stress on a very small area. Perhaps the builder failed to provide enough material in that area, and likely failed to provide a sufficient backing plate, well bonded to the deck's underside. So a thorough repair will include more than just the obvious cosmetic issues--it will mean solving shortcomings created by the original builder.

This is such a good example of one of the essential differences between entry-level and bluewater boats--one's ability to withstand expected loads.

best, andy
__________________
1st rule of yachting: When a collision is unavoidable, aim for something cheap.
"whatever spare parts you bring, you'll never need"--goboatingnow
"Id rather drown than have computers take over my life."--d design
Terra Nova is offline   Reply With Quote
Old 20-05-2007, 12:58   #5
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Mark, because you had trouble where a cleat was pulled from your deck I would suspect that the hardware on your boat was installed with inadequate backing plates. This is one place to check very carefully. You might also want to double check the fiberglass layup in the areas where you have stress cracks to see if it needs reinforcement.
__________________
The Blue Dot Campaign. This Changes Everything.
DeepFrz is offline   Reply With Quote
Old 21-05-2007, 05:24   #6
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,573
Images: 240
See also some earlier discussions, especially Jeff’s "Primer..":

“A Primer on Fiberglass Construction”
A Primer on Fiberglass Construction

“Gelcoat Crazing”:
GELCOAT CRAZING (Part 1)

Interior Crazing:
Interior Crazing
__________________
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 21-05-2007, 07:56   #7
Registered User
 
markpj23's Avatar

Join Date: Nov 2005
Location: Black Hills, SD
Boat: Now Boatless
Posts: 1,148
Images: 47
Quote:
Originally Posted by DeepFrz
Mark, because you had trouble where a cleat was pulled from your deck I would suspect that the hardware on your boat was installed with inadequate backing plates....
Yeah - I already know that cleat was installed w/o backing plates by the previous owner - not the factory. Checking the others to be certain is high on my list.

The stress cracks I have are on the cabin sides in the corners of some fixed ports / plex windows. Right at the radius curve on the lower section of the port. Cracked in the same spot on both sides. I assume this is due to flex.

Thanks for the replies here folks!
__________________

__________________
Mark
markpj23 is offline   Reply With Quote
Reply

Tags
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
What to use for a Barrier coating... on a freshly-sanded gelcoat bottom? SkipperCanuck Construction, Maintenance & Refit 16 16-05-2007 22:42
need VHF gelcoat repair and diesel repair converted to DVD schoonerdog General Sailing Forum 6 05-04-2007 20:23
Tools For Fibreglass and Gelcoat Repair Sonosailor Construction, Maintenance & Refit 5 01-04-2007 00:37
Will Gelcoat adhere to Epoxy? GordMay Construction, Maintenance & Refit 22 03-12-2006 23:59
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 23:56.


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.