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ratface View Drop Down
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Posts: 686 		Post Options Post Options   Quote ratface Quote  Post ReplyReply Direct Link To This Post Topic: RS300 transom
    Posted: 20 Sep 07 at 6:54pm
nope i cant access the indside of the hull at the back... even if i was to put a hatch there it wouldn't really take one
BLYM
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Paramedic View Drop Down
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Posts: 929 		Post Options Post Options   Quote Paramedic Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 07 at 7:38pm
Originally posted by No. 5

Originally posted by Paramedic

Don't use epoxy on a polyester built boat.

Why not?

Because the two resins have differant properties. If the repair is in an unstressed area you might get away with it, but if it's a loaded area and you use epoxy on a polyester boat the epoxy is harder and less flexible then the rest of the boat. This means that if the boat does flex ( as it always will under load) it comes to an abrupt halt at the repair and what usually happens is that the repair starts to come away from the surrounding material.

I thought 300s were polyester? It's been a while since i've seen one though!
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craiggo View Drop Down
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Posts: 1810 		Post Options Post Options   Quote craiggo Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 07 at 7:21am
I though 300s were epoxy not polyester.

Most of the temporary repairs that have taken place at Nationals by LDC have needed re-doing in epoxy following the event.

Polyester is I believe easier to work in a short period of time but as has been said can come away from the surrounding area in time due to the different expansion and elastic properties between it and epoxy.

Paul
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Rob.e View Drop Down
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Posts: 545 		Post Options Post Options   Quote Rob.e Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 07 at 1:20pm
The 300 is Epoxy. Don't think this is the boat that had the accident on the way to the nationals, this used to belong to one of the class stalwarts, and it's driving me mad trying to remember his name! It originally had pro-grip all over the inside. Think it was the guy who did the website....I had to do turns at the windward mark at the Lee nationals after touching this boat
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No. 5 View Drop Down
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Posts: 115 		Post Options Post Options   Quote No. 5 Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 07 at 1:41pm

Thanks Paramedic.

I assume the same is also true for vinylester built boats?
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Isis View Drop Down
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Posts: 2753 		Post Options Post Options   Quote Isis Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 07 at 1:53pm
Idealy yes no5... though vinylester isnt too far from epoxy in terms of properties
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JimC View Drop Down
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Posts: 6660 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 07 at 2:21pm
Its more complicated... polyester on epoxy is a no no, because the styrene in the unreacted polyester attacks the epoxy surface and you don't get much of a bond. Epoxy on the other hand will grip polyester very well - probably better than more polyester does, but you do have to consider the difference in the other properties.

The moral of the story really is don't buy polyester boats... Cheap knockabout boats are best in thermoplastic, performance boats are best in epoxy.
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