I can only find galvinized of bnp ones.

Ta.

Heat them up on a gas ring or cooker hob, and drop them in a bucket of oil.

Best to have the oil outside in case of flare up of the oil.

Is that for galvinized or bnp?

Make that BZP not bnp

Bzp,as thegalvanised have a coating already, dont lower the bolts into the oil slowly or it will catch fire , use some pliers or tongs and drop them in.

ok, cheers – i’ll try a dummy run tomorrow – unless anyone can name a source for black, i thought they’d be a standard colour

Bump for the daytime crew.

Loads of sellers on ebay, shirley some will have black.

Nope – not that I can find. Black oxide from USA or oriental in bulk.