Define very quickly? Compressors will naturally heat up because compressing air creates heat (something about thermodynamics and gas laws, it has been a while since I took physics). [This](https://air-compressor-help.com/compressor-motor-is-getting-really-hot/) may help you with some troubleshooting if it is getting dangerously hot, and you can also contact the compressor's manufacturer as well.

I won't be as much help for the second question, but I can give it a shot. The color looks like a white tan, so something like Vallejo's iraqi sand may be close. Someone else with more experience in that area can probably help more.