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 Post subject: epoxy or polyester resin
PostPosted: June 2nd, 2003, 10:42 am 
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Joined: March 5th, 2003, 7:00 pm
Posts: 97
Location: Lac-Mégantic, Quebec,Canada
Need to repair my bow's skid plate...
I don't know what the guy who owned it before me used...

Is polyester resin OK?
I know that epoxy work best....but will polyester do the job?

I only need to put a 3'' x 3'' patch, so I tought it could simple and fast to glue a piece of fiberglass with polyester resin...
Any advice

Thanks
david


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PostPosted: June 2nd, 2003, 11:13 am 
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Joined: December 29th, 2002, 7:00 pm
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Location: Bancroft, Ontario Canada
I've talked to boat builders who won't combine polyester and epoxy layers in the same boat, because the bond isn't the best and the two may separate with time. On skid plates, the bond may be good enough. I have an old whitewater kayak (Madawaska) with the upper half polyester and the lower half epoxy, and it held together for at least five years of use. No separation visible at the joint line.

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PostPosted: June 2nd, 2003, 12:05 pm 
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Joined: March 5th, 2003, 7:00 pm
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Location: Lac-Mégantic, Quebec,Canada
Thanks frozentripper,
To make myself clearer...

The job I need to do is on my Royalex Dumoine.
The bow' skid plate received in the past years several hits on rock... and the skid plate cracked... and a small patch got loose...
So I wanted to know if fiberglass and regular chep resin would do fine?

From what you wrote... i'll give it a shot for sure..

D


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PostPosted: June 2nd, 2003, 12:14 pm 
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Joined: March 17th, 2002, 7:00 pm
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Location: Ottawa, Ontario, Canada
I'd agree with the polyester being acceptable. It is worth a try and it won't be a problem if you have to take it off. Make sure you rough up the surface with coarse sandpaper before applying your patch. Any resin doesn't like to stick to resin that's already cured.


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PostPosted: June 2nd, 2003, 2:36 pm 
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Joined: October 2nd, 2002, 7:00 pm
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Location: seattle, Washington USA
Hi David, I've worked a lot with both polyester and epoxy resins. The owner before you, probably used epoxy, as that is what normally comes with skid plates and provides the best bond. Epoxy will bond to polyester quite well. However, the reverse is not true. If you can eliminate by sanding/grinding, the suspected epoxy, then, assuming the boat was laminated with polyester or vinylester resins, you will have no trouble with polyester. Epoxy is such a superior bond and much more flexible than polyester, I would go with that. The added expense is very little.


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PostPosted: June 2nd, 2003, 2:40 pm 
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Joined: October 2nd, 2002, 7:00 pm
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Location: seattle, Washington USA
Hi David, I've worked a lot with both polyester and epoxy resins. The owner before you, probably used epoxy, as that is what normally comes with skid plates and provides the best bond. Epoxy will bond to polyester quite well. However, the reverse is not true. If you can eliminate by sanding/grinding, the suspected epoxy, then, assuming the boat was laminated with polyester or vinylester resins, you will have no trouble with polyester. Epoxy is such a superior bond and much more flexible than polyester, I would go with that. The added expense is very little.

I just saw that its a Royalex boat. I would still recommend epoxy.


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