Like Tree0Likes

How much gel-coat cand be removed before having to re-gel?

Reply
Old 02-19-2003, 07:53 PM
  #1
Registered
Thread Starter
 
Pure Energy's Avatar
 
Join Date: Oct 2000
Location: N. NJ, Eastern LI
My Boats: 2001 Superboat Y2K
Posts: 3,027
Question How much gel-coat cand be removed before having to re-gel?

The bottom is coming along nicely. I did have to remove a lot of scratches though. I think the guy that owned it before me towed it to the ramp without a trailer! I have sanded with 60 grit, 150, and 320. There is no fiberglass showing through. Should I re-gel anyway, or continue sanding smooth and watch for stress cracks during the season?
Pure Energy is offline  
Reply With Quote
Old 02-19-2003, 08:08 PM
  #2
Charter Member #232
Charter Member
 
Audiofn's Avatar
 
Join Date: Oct 2000
Location: Carlisle, MA USA
My Boats: 1979 Formula 302, 99 Formula 353, 81 Donzi 18 2+3 with 454
Posts: 18,379
Default

Not sure how thick Sonic made the gel way back then. You may be able to ask TooOld and get some insite there. As far as sanding it down, If you do go through you can blend the Gell with new stuff if you go through to the glass. You mentioned stress cracks. By thining out the gel you are actually reducing the likelyhood that you will have cracks. Thick gell is ussually the cause of stress cracks. I had a million in my dash and by sanding them down the actually all disapeared except for two of them. I would not sand with anything more then 300 grit if you can avoid it. Otherwise you will likely see the sand scratch when you buff it out. Good luck
__________________
Put your best foot forward!
Audiofn is offline  
Reply With Quote
Old 02-19-2003, 08:16 PM
  #3
Transplanted to KS
Gold Member
 
Outlawcowgirl's Avatar
 
Join Date: Aug 2002
Location: Topeka, KS
My Boats: 1993 24 ft Baja Outlaw that is too loud for the State of Kansas
Posts: 1,685
Default

What about little stress cracks in the fairing? Can you sand those out?
Outlawcowgirl is offline  
Reply With Quote
Old 02-19-2003, 08:23 PM
  #4
Charter Member #232
Charter Member
 
Audiofn's Avatar
 
Join Date: Oct 2000
Location: Carlisle, MA USA
My Boats: 1979 Formula 302, 99 Formula 353, 81 Donzi 18 2+3 with 454
Posts: 18,379
Default

Damn I knew I was going to open up a pandora's box

Boatless I would say live with them or have a prol look at it. The only reason that I offered up the above advice was that he had already dug into it quite a bit.

Catch me in the chat later and I will offer up any advice that I can as far as fixing that stuff up

Jon
__________________
Put your best foot forward!
Audiofn is offline  
Reply With Quote
Old 02-20-2003, 01:43 PM
  #5
Registered
 
32storm's Avatar
 
Join Date: May 2002
Location: Rochester, NY
My Boats: Boatless....
Posts: 589
Default

Just remember if you remove too much gelcoat, you increase the possibility of getting blisters. Especially if boat is left in the water for a period of time. As far as the stress cracks, the concern is always if the cracks are just in the gel or are they into the glass. If into glass, obviously these need to be fixed. But,you won't know until you start grinding or sanding on them.
32storm is offline  
Reply With Quote
Old 02-20-2003, 05:56 PM
  #6
Registered
 
Sean's Avatar
 
Join Date: Oct 2000
Location: Darien, CT
My Boats: Donzi Sweet 16
Posts: 3,161
Default

I've never heard that thin gel coat causes blistering??? I always thought that thicker gel leads to blistering, or incorrectly applied paint over gel...

Anyone else?
Sean is offline  
Reply With Quote
Old 02-20-2003, 07:05 PM
  #7
Platinum Member
Platinum Member
 
mcollinstn's Avatar
 
Join Date: Sep 2001
Location: tn
My Boats: 1991 F311SR1
Posts: 5,491
Default

Gel is porous. Still usually if it is thick and crack-free, the moisture will not make it to the mat. Thin gel sounds like blister time to me.

Course I got blisters on a vinylester "blister-proof" SeaRay cruiser... Some boats get em, some boats don't.
mcollinstn is offline  
Reply With Quote
Old 02-20-2003, 08:30 PM
  #8
Registered
 
H2Xmark's Avatar
 
Join Date: Apr 2001
Location: beaumont tx
My Boats: 1997 Fountain 35 Lightning
Posts: 1,703
Default

mcollin is right about the gel being porous[permeability], water will pass through it, gel is polyester and it is not water proof. blisters are caused by the fiberglass mat under the gel not being cured all the way, are contaminates in the glass. if you do not have any blisters on the bottom Ken, I would just keep an eye on it, if your boat has not blistered by now chances are it will never blister, you keep it stored out of the water don't you? if so I would not worry to much, gel most of the time is 10 to 22 mils thick, if you sand down to 7 or 8 you will be ok, and most Sonics are a little on the thick side good luck
Mark
H2Xmark is offline  
Reply With Quote
Old 02-20-2003, 11:58 PM
  #9
Registered
Thread Starter
 
Pure Energy's Avatar
 
Join Date: Oct 2000
Location: N. NJ, Eastern LI
My Boats: 2001 Superboat Y2K
Posts: 3,027
Default

It is a 1990 and the gel is pretty thick. I do not keep it in the water, and there are no existing blisters.
Pure Energy is offline  
Reply With Quote
Old 02-21-2003, 08:05 AM
  #10
Registered
 
H2Xmark's Avatar
 
Join Date: Apr 2001
Location: beaumont tx
My Boats: 1997 Fountain 35 Lightning
Posts: 1,703
Default

I don't think you will have any problems at all Ken, I would keep an eye on it from time to time though, maybe someone else will add to this with some more input,
Mark
H2Xmark is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
outlaw 32
Baja
4
05-14-2008 11:49 PM
Chris288
Fiberglass and Paint
7
09-20-2007 05:31 PM
jayhawk261
Fiberglass and Paint
10
04-02-2007 04:30 PM
JJONES
Fiberglass and Paint
6
10-12-2006 10:36 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 05:13 AM.


Copyright 2011 OffShoreOnly. All rights reserved.