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JBASHAM

  • Karma: +1/-0
Fiberglass filler
« on: September 19, 2016, 09:11:38 AM »
Long story short last year I glassed in my bulkhead without using a fillet where the deck and bulkhead meet... Well now I know why you're supposed to use the fillet, it's cracked all the way around.

I don't have the time or resources to order the materials to make my own "peanut butter".

So my question is would I be OK using a Bondo style body filler to create a fillet to glass over?


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  • Boat #1: 1988 19ft Sunray I/O
  • Boat #2: 1982 18ft Bahner Bubbledeck
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GT Jets

  • Karma: +192/-0
Re: Fiberglass filler
« Reply #1 on: September 19, 2016, 09:37:09 AM »
Long story short last year I glassed in my bulkhead without using a fillet where the deck and bulkhead meet... Well now I know why you're supposed to use the fillet, it's cracked all the way around.

I don't have the time or resources to order the materials to make my own "peanut butter".

So my question is would I be OK using a Bondo style body filler to create a fillet to glass over?


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Not really. Bondo will crush like drywall under abuse. I have used Sea Going Epoxy with good results,  not the heavy duty. The regular.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

angermgmt

  • Karma: +8/-0
Re: Fiberglass filler
« Reply #2 on: September 19, 2016, 09:38:14 AM »
I don't think my glass guy used filler when he capped mine.  I could be wrong I suppose.


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JBASHAM

  • Karma: +1/-0
Re: Fiberglass filler
« Reply #3 on: September 19, 2016, 09:45:48 AM »

Not really. Bondo will crush like drywall under abuse. I have used Sea Going Epoxy with good results,  not the heavy duty. The regular.

GT

Yeah I don't have time to order any of that right now either. We're going to Parker this weekend. Guess I'll just glass it with some 1708 without a fillet and fix it right when I have time. Thanks!


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  • Boat #1: 1988 19ft Sunray I/O
  • Boat #2: 1982 18ft Bahner Bubbledeck
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Re: Fiberglass filler
« Reply #4 on: September 19, 2016, 09:51:52 AM »
I don't think my glass guy used filler when he capped mine.  I could be wrong I suppose.


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I think he's referring to the front bulkhead under the deck,  not the gunwale.  Normally when they cap a hull, it's normally all fiberglass products sometimes using a little filler for minor defects before priming.  If it's gel,  they won't  (or shouldn't) use filler,  but rather cabosil or similar.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

GT Jets

  • Karma: +192/-0
Re: Fiberglass filler
« Reply #5 on: September 19, 2016, 09:52:51 AM »
Yeah I don't have time to order any of that right now either. We're going to Parker this weekend. Guess I'll just glass it with some 1708 without a fillet and fix it right when I have time. Thanks!


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If there is a Tap Plastics near you, they should stock ground glass or Cabosil.
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

JBASHAM

  • Karma: +1/-0
Re: Fiberglass filler
« Reply #6 on: September 19, 2016, 12:55:06 PM »

If there is a Tap Plastics near you, they should stock ground glass or Cabosil.

I wish. I live in the boonies. What's your recipe to make thickened resin fillet?

My plan was polyester resin chopped/milled fiberglass and fumed silica a.k.a. cabosil


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Re: Fiberglass filler
« Reply #7 on: September 19, 2016, 12:59:07 PM »
I wish. I live in the boonies. What's your recipe to make thickened resin fillet?

My plan was polyester resin chopped/milled fiberglass and fumed silica a.k.a. cabosil


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Yep,  keep adding dry until you get chimney mortar consistency. Add hardener normal,  no hot mix.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

JBASHAM

  • Karma: +1/-0
Re: Fiberglass filler
« Reply #8 on: September 19, 2016, 03:17:38 PM »
Could I just use kitty hair to make the fillet?
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selbycnlb

  • Karma: +1/-0
Re: Fiberglass filler
« Reply #9 on: September 19, 2016, 03:30:13 PM »
How would West systems 404 compare to the cabosil?


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