Dusty

[Louwai]

I reckon it might be more of a case of "NFI". The guy sounds like a great tradie, but obviously that's his whole life. Seems like he knows very little of anything outside of his trade. Undoubtedly he would have had no idea what your DJ gear is worth & the bike, Well!!!! That's "just a bike" isn't it???
I'll bet the thought to cover things just never entered his mind.

The gents in our office building is very nice, fully tiled floor to ceiling. On the wall there is a large patch of "dots".
Some tradie has been doing some plimbing work, cut the steel piping with a grinder & sprayed the sparks all over the wall.
Hot sparks melt the glaze on the tiles & voilah, you have non-slip walls with little bits of metal melted into the tiles.