Grinding, " diesel " noise under valve covers

Could piston skirt coatings help quiet the OP's piston slap down, if that what it is?
I know it won't eliminate it but it could make it more livable.
The sound don't bother me... it the fact I could destroy something I worked my but off for, on both and ALL ends, ( meaning i bought parts,, had parts, bought more parts,, and worked to put em on,, in.. and it gets a Lil warm here in the outdoors) that I can't replace.....