Like Tree0Likes

Gel Coat Stress Crack Repairs

Reply
Old 07-11-2007, 01:31 AM
  #1
Registered
Thread Starter
 
Join Date: Oct 2004
Location: Newbury Park, CA
Posts: 1,425
Default Gel Coat Stress Crack Repairs

I looked at a boat which had a lot of gel coat stress cracks which were repaired by grinding out the cracks, filling them, and repainting the entire area with Imron. Is this a permanent repair? Won't the same cracks just come back in the Imron?

Michael
Michael1 is offline  
Reply With Quote
Old 07-11-2007, 08:37 AM
  #2
Registered
 
Join Date: Feb 2004
Location: MT. JULIET, TN.
My Boats: '99 33 Outlaw HP 500's,
Posts: 3,698
Default

Quote:
Originally Posted by Michael1 View Post
I looked at a boat which had a lot of gel coat stress cracks which were repaired by grinding out the cracks, filling them, and repainting the entire area with Imron. Is this a permanent repair? Won't the same cracks just come back in the Imron?

Michael
Depends on whether they glassed them or just used the paste type repair. If it's got that many cracks I'd be looking at another boat.
kennyo is offline  
Reply With Quote
Old 07-11-2007, 10:13 AM
  #3
Who Me?
Platinum Member
 
FeverMike's Avatar
 
Join Date: Jan 2001
Location: Tampa
My Boats: 2006 38TE Fountain
Posts: 6,656
Default

Gel coat cracks are cause by stress in the body of the boat at that particular area. You can fix cracks all day but if you do not fix the problem underneath they can come back.
FeverMike is offline  
Reply With Quote
Old 07-11-2007, 10:21 AM
  #4
Neno the mind boggler
VIP Member
Trade Score: (1)
 
glassdave's Avatar
 
Join Date: Sep 2001
Location: toledo oh
My Boats: Batboat, 38 Scarab Thunder, 16 Sidewinder, 27 Magnum
Posts: 12,667
Default

Quote:
Originally Posted by FeverMike View Post
Gel coat cracks are cause by stress in the body of the boat at that particular area. You can fix cracks all day but if you do not fix the problem underneath they can come back.

pretty much it. also it really depends on what was used to fill the area after it was ground down. many times they do return because of underlying problems or excessive rough water use.
__________________
Throttles- Cleveland Construction 377 Talon
08 OPA Class 1 National Champion
08 Class 1 Geico Triple Crown Champion
08 OPA High Points Champion
10 OPA Class 1 National Champion ( happy now Ed! )
glassdave is offline  
Reply With Quote
Old 07-11-2007, 11:53 AM
  #5
Forum Regulator
VIP Member
Trade Score: (1)
 
Sydwayz's Avatar
 
Join Date: May 2001
Location: Worldwide
My Boats: 17' Speedliner Cat & O.P.B.
Posts: 21,920
Default

I just got a lesson in gelcoat as I had my throttles moved and a few dings filled in.

The more important factor is the gelcoat itself, specifically its thickness. Fiberglass does have the ability to flex. The gelcoat above it needs to be able to flex as well. I don't remember the exact .-mil specs, but too thick, and the gelcoat will not flex, and it just cracks. Too thin, and the gelcoat will crack and flake away. Its a fine science.

Speeddoc here on OSO taught me a lot over the last 2 weeks. He did some great work on my boat.
Sydwayz is offline  
Reply With Quote
Old 07-11-2007, 02:00 PM
  #6
Registered
 
Tantrum's Avatar
 
Join Date: Oct 2000
Location: USR, NJ
My Boats: Stray Cat Statement Marine
Posts: 4,000
Default

Gelcoat has a military spec for thickness?
Tantrum is offline  
Reply With Quote
Old 07-11-2007, 02:47 PM
  #7
Neno the mind boggler
VIP Member
Trade Score: (1)
 
glassdave's Avatar
 
Join Date: Sep 2001
Location: toledo oh
My Boats: Batboat, 38 Scarab Thunder, 16 Sidewinder, 27 Magnum
Posts: 12,667
Default

aprox. .010" to .020" is preferred
__________________
Throttles- Cleveland Construction 377 Talon
08 OPA Class 1 National Champion
08 Class 1 Geico Triple Crown Champion
08 OPA High Points Champion
10 OPA Class 1 National Champion ( happy now Ed! )
glassdave is offline  
Reply With Quote
Old 07-11-2007, 04:03 PM
  #8
Forum Regulator
VIP Member
Trade Score: (1)
 
Sydwayz's Avatar
 
Join Date: May 2001
Location: Worldwide
My Boats: 17' Speedliner Cat & O.P.B.
Posts: 21,920
Default

Quote:
Originally Posted by Tantrum View Post
Gelcoat has a military spec for thickness?
millimeters! See you get rid of the AT, and everything goes to pot.
Sydwayz is offline  
Reply With Quote
Old 07-11-2007, 05:34 PM
  #9
Registered
 
Tantrum's Avatar
 
Join Date: Oct 2000
Location: USR, NJ
My Boats: Stray Cat Statement Marine
Posts: 4,000
Default

My pot days went the way of tequila
Tantrum is offline  
Reply With Quote
Old 07-11-2007, 08:22 PM
  #10
Registered
Thread Starter
 
Join Date: Oct 2004
Location: Newbury Park, CA
Posts: 1,425
Default

This was on a mid-90's Skater, and I've been told they get a lot of gel coat stress cracks. Stay away from them?

When would you re-gel coat a boat, rather than fill and paint?

Michael
Michael1 is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mattd7
Donzi
1
04-22-2008 07:00 AM
IndianaHeat
Prop Talk
2
08-30-2006 04:19 PM
LPBoater
General Q & A
1
03-22-2004 09:31 PM
38flatdeck
General Boating Discussion
3
03-29-2003 07:11 PM
Shooter
General Q & A
4
12-20-2002 06:11 PM



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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 09:45 AM.


Copyright 2011 OffShoreOnly. All rights reserved.