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I used to buy 4' x 8' sheets of urethane that came
in 2" and 4" thickness. It was used for ceiling and wall construction in
freezers. I have seen thicker blocks of the stuff. It was also available as
pouring, moulding and mix and spray material. It should still be available. It
was fairly large celled, real brittle, as the man said, cut and formed rather
easily; but, had almost no strength. It also was flamable as heck. Took to
being painted with latex and sheetrock topping mixture real well. This sanded
almost as easy as the foam.
jofarr, soddy tn
----- Original Message -----
Sent: Thursday, December 15, 2005 5:41
PM
Subject: [FlyRotary] Re: cowl
If you really want to
make quick work of shaping your cowl get some Urethane foam from you local
roofing supplier or florist (used in the bottom of vases to hold flowers).
It’s a really light weight and brittle foam that you can sand my just looking
at it (well almost). It can be shaped really quickly – but you need to be
really careful with hitting or touching it – it dings really, really easily.
Also, duct tape won’t stick to it so you do have to fill the finished shape
with Micro or plaster / drywall mud and then sand that smooth and paint for
release before fiberglassing.
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