Originally Posted by Tim M
I've got a trailer I want to modify. The old galvanising is looking pretty tired, plus I want the new bits galvanised. If I modify it and send it to the galvanisers, will they accept it as a mix of old and new? Is there any special prep you need to do to previously galvanised steel?
Yep and charge extra to sort it out
You will probably need to shot blast the whole thing, then any galvanizing left on will be sorted by the pickling treatment pre galvanizing
All box tube sections to be drilled for draining + to allow the air to vent
After galvanizing you will need to clean out(drill) any holes + re tap any threaded holes before refitting of bits
Oh and blow out any shot blasting dust with an air line( before its galvanized)
Also any pigeon crap welds will often blow apart during galvanizing so they need to be done by someone who knows what they are doing