MDF or ply?

[alex wight]

The foamex is a relatively strong material when supported. It's lightweight which is why it's used for shop signs ect I used a scrap piece to just scratch the surface when doing jobs, to let me see what I was ready to do on the real material. It saves making errors on the real job. It's non porous as well so is very good for a vacuum bed, and if fluid is used, it doesn't swell either.