Waywiness does not bother me, but that twistiness does. I tried to do ft nutball an ft flyer and both were warped so much that I could not fly them it straight (rolling automatically). Trimming did not help because they do not have ailerons. Worst thing that this twisted foam does is that it returns to this twisted state, so fuselage is the most problematic part of the plane. More complex wings handle warpage better.
Any tip for getting them straight?
That's how Elmers board is, the kind standard 'paper board' in the UK and AUS. I haven't tested it before but Elmers is about twice as strong and twice the weight.
ROSS board is similar in weight to Adams and they use a glue adhesive but their foam cells are weaker. I'll have to test that.
Are you using white board or water resistant?
I just got 10, going to check a few more in the area. The new stuff is right next to the old in the stores and you can really see the difference. . We also had a Dollar Tree burn down recently, I built my Storch from that store, now my Storch can be called a ghost plane.
I only use FT WR foam pictured on post #14, without any paint or anything similar that would cause warpage. WR FT Foam I got from graupner is so heavily twisted that it is impossible to use if for simple builds (flyer, nutball, delta,old fogey). With simple builds I had more luck with floor insulation foam covered with tape.
I can still use this foam for more complex and reinforced builds like baby brit and bloody wonder. But with my flying skills it is quite an effort to fly them. With almost any landing I brake or bend a prop.
I was really happy when graupner offered this foam in europe although it is was quite expensive stuff 2.92 usd per foam (when getting 50).
I am werry disappointed in Flite Test for offering such a low quality product!
Thanks everyone on the heads up about the new Adams recipe. All my stores nearby had both the old and new on the shelves. I went to multiple stores and bought them out of the old stock. Even picked up the imperfect and wringled ones that I would normally pick through. 120 sheets total. Hopefully and better alernative can be worked out by the time I blow through my stock.