Hi what paint stripper are you using as you need a neutral ph type or you will have bad corrosion issues after painting, even if you rinse them straight away.

It is ok to sand blast mag but as already said low pressure and fine grade or better with walnuts etc.

Ps don't take them to Romax in Teesside they recked 12 mag oz wheels of mine by acid dipping them constant corrosion after power coating. Ian Jemison Engineering of York recommends fine sand blasting taking your time.

Steve