Can Guanyin made of resin be baked with fire?

Whether it's copper or porcelain, it's just the material of the statue, and what the Buddha statue wants to convey to you is compassion and wisdom.

This has nothing to do with the material.

I hope you can respect the Bodhisattva, no matter what material the statue is made of, and then you can also show the same compassion to all beings, then the compassion in your heart is the correspondence between you and the Bodhisattva.