Can you use Colossus safely on silicone dildos? I heard people say that putting 2 silicone toys together can make them fuse or melt into each other.

Are there any materials I should avoid using this with (UR3, Rubber...?)

Also, how big of a dildo can I add it to in terms of girth by circumference? Like if the toy has a circumference of 6 inches, can I use him with Colossus?