Thread: Discussion IOM General Discussion
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Old Dec 23, 2012, 09:26 AM
SimonRobinson is offline
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United Kingdom, North Shields
Joined Feb 2012
36 Posts
Building with foam

I've been putitng off starting building an IOM for nearly a year now, but I seem to have finally made time to get one started in the New Year. I am still trying to decide whether to make the boat in wood, or make a male plug in foam and glass over that. This will be a one off hull, I don't intend to make a female mould.
I could do with some advice on the foam idea assuming I decide to make the hull & deck in epoxy glass rather than a wood hull:
1. When making the plug, do you use thin plywood shadows and then infill with roughly cut out foam, and then cut / sand the foam,
or
Do you just glue card shadows to the foam, cut out foam ( I have 50mm extruded polyfoam already), glue together and shape. The main danger with this is that it would be easy to remove too much I guess, whereas with ply it might be easy to get hard spots.
or
Have you any other suggestions using foam.

2. I realise I would need to do some filling after the sanding, but do I need to glass, then more filling and fairing to stiffen it prior to making the hull, or can I get away with just using shrink wrap over the foam (or foam and ply) and then lay up the main hull?

Thanks in advance Simon
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