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PostPosted: Thu Aug 25, 2011 7:02 am 
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Location: Jersey Shore
Lakewateree wrote:
I'm assuming bondo wouldn't work?


Actually, Bondo is what I used because I had some around. It seems to have worked fine. However Formula 27 would have been the better filler to use. If I do the job again, I'll use Formula 27.

The basic order of operations was 1) rough sand, 2) apply glass to build up surface 3) rough sand to fair in edges only and lightly scuff the surface of the glass 4) apply filler to fill in the glass weave and eges 5) fair in filler smooth 6) apply gelcoat 7) sand up to 600 grit wet & dry.

Be sure to wipe with acetone prior to applying the glass, filler, or gelcoat. And don't touch the surfaces with your bare hands after you've done the acetone wipe.

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PostPosted: Thu Aug 25, 2011 7:10 am 
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Location: Lugoff, SC
Thanks. I've got bondo already so I'll use it. Do you use waxed or unwaxed gel coat? What the difference btw


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PostPosted: Thu Aug 25, 2011 7:12 am 
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See where you used waxed gel coat after looking back. Still don't know the difference though


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PostPosted: Thu Aug 25, 2011 7:47 am 
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Location: Saint John, NB Canada sailing on Washademoak Lake
Wax gelcoat is used for the final coat. If you do multiple coats, you need to sand and wash with acetone between coats.

Waxless remains tacky and subsequent coats can be applied on top without prep work. That last coat will need to contain wax or a curing agent(I forget the name) in order to cure hard and dry.

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1978 Hobie 16 Keoke, sail# 36 84
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PostPosted: Thu Aug 25, 2011 7:48 am 
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Location: Saint John, NB Canada sailing on Washademoak Lake
Lakewateree wrote:
Thanks. I've got bondo already so I'll use it. Do you use waxed or unwaxed gel coat? What the difference btw

I don't know how well Bondo stick to fiberglass resin and how well gelcoat stick to Bondo. Might want to research that.

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1978 Hobie 16 Keoke, sail# 36 84
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PostPosted: Thu Aug 25, 2011 10:49 am 
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Location: Jersey Shore
The bondo has held up fine thus far (about 4 months on the beach). No issues with bonding to fiberglass or gelcoat. As I said, if I were to do this job again, I'd use Formula 27, but the bondo seems to have worked fine.

It doesn't really make a difference whether you use waxed or unwaxed gelcoat as long as you understand that with waxed gelcoat, you need to sand between coats. With unwaxed gelcoat, you need to add the surfacing agent (liquid wax) prior to doing any sanding. The sufacing agent is added similarly to the MEKP (catylest) - you measure out the amount you need and just mix it in to the resin.

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