Safety of Acrylic silicone?

[froghub]

Hello guys.
So i made some backgrounds and side out of plywood, foam and "acrylic mastic" which is something like silicone, but can be painted and easier to remove of hands. This will be for my pacman frog.
So i would like to know if you guys believe that this can be in any way toxic? It is rated A+ in gas emissions and smell, which is none.
Here are some pictures.

What do you guys think? After a couple of washes should be good no?
Or should i cover it with some normal 100% silicone instead?
If you'd like i can post some pictures of the acrylic mastic itself.
Thanks.