used abrasive material К-00-04-16 . After supersonic sandblasting with Dymet holes were formed.
very big holes
but for Cold Spray technology there is nothing impossible. At first aluminum with zinc А-20-11 . This powder material closes any holes. Then deletes excess metal and we put a zinc layer Z-00-11.
Then it is possible to apply acid soil for surfaces with zinc, then a hard putty, etc.