I've been wanting to build the FT spitfire for a while now but I can't seem to find any foam board in the UK.
What is it that people use here?
Depron foam is the main thing I have found on Ebay and amazon really.
I've been using the Hobby Craft foam too. I've also bought a couple of speed build kits from FT so can give a comparison between the "real" foam and the Hobby Craft stuff.
The DTFB foam is lighter, but its also cr@p quality by comparison... The paper is easy to peal off, the foam is lower density/compresses easier. If you peel the paper, it will remove some foam too, its very well adhered.
The Hobby Craft foam paper has a surface to the paper that makes it more resistant to liquid - it needs a bit of rubbing to remove the paper layer and it leaves a thin layer of glue behind (not sticky and its smooth). The foam seems to last longer too (due to the density?)
It IS heavier though. (there are figures in the FT forums with weight comparisons) I recall its roughly double, so *most* planes will be fine, but the very light/low power ones may have issues as spec'd.
On a related matter - Hobby craft also stock a card like paper called Ticket paper (I think) that seems to be the equivalent of the Poster board in the plans.
Here's my nnA10 built from Hobby Craft foam. It flies well and is robust at my local field which is a heath with gorse bushes!
nnA10 build log