I would think that would be the case with a copper cloud, but there obvious limits to ruins power such as he is unable to see clearly when there is enough metal or that he can't read minds or change and read what is written in metal. These things don't seem to be a matter of power, but limits that are wired into the way the world works. So I was wondering if aluminum might be similar as it has a lot of anti investiture effects (it has no atium shadow, gold healing won't right with aluminum in the wound, and I am not sure if we ever saw a duralumin or nicroburst on steel or push in relation to aluminum, but I think that it wouldn't work). So as I was wondering if aluminum might not provide resistance to ruin, but block him out all together.