| PS was good, although I have not jumped on it or hammered it.

Bead foam, right?

| Remarkably stiff, I had to cut slots in the inner layer of glass to get it to conform to the fairing shape.

How does this compare to other core material you may have made the faring out of? This was wet lay up over solid core, or was the core detailed with resin pockets or something?

| The rudders halves are built, one of them is joined. The ps moulds did not like being filled with sand (alternative to vac bagging) and compressed a little, but once I realised this, they were ok.

So, you were at the limits of the mold strength, and it yeilded some?

| The compression means the leading edge radius was bigger than it should be. Pretty easy fix with some bog and a straight edge. The Foamular or Dow 400 would be better.

I was just thinking of the XPS as a core material. The potential as a mold material I did not think of.

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