3D Background Is Harmfull For Newts ?

[ReptileLover]

Hello, everyone, I made a 3d background from foam, grout and I used hot silicone for foam after I covered with grout
is will harmful to my Southern Crested Newts?
Thanks and sorry about my English

 

[ReptileLover]

If anyone wants to make 3d background for their newts i can help him or make guide in this site