Maker Foam kit parts shrink!

[Velojet]

I'm building a Mighty Mini Old Fogey but have found that the Maker Foam kit parts have shrunk so that edges are now a U-shaped groove instead of a flat cut (see pictures).

(The parts have been stored and handled in normal temperature and moisture conditions.)
This shrinkage causes two problems, one for the build and one for flying:
1) In the build, it means that glue adheres only to the outer paper covering, seriously reducing strength.
20 In flight, I anticipate that the grooved edges of the flying surfaces will reduce lift and at worst cause erratic performance.
What do you advise me to do to deal with these problems?
Thanks!

 

[Tench745]

This is normal. The laser melts back the foam as it cuts. Build as normal.

 

[LitterBug]

If you are worried about the leading edges, you could do a variety of things to "fill" them in. 1) Small bead of hot glue followed by a wipe with a scratch piece of foamboard. (this is mentioned in several build videos) 2) glue a small light skewer in there. 3) use a super fine packing tape around the leading edges.

I've built quite a few of the speed build kits and never had any real problems due to the laser cut shrinkage.

 

[Velojet]

@Tench745 Thanks for info.
@LitterBug Thanks for helpful suggestions.