Anodise the bottom black.
It won’t anodise nicely
It will have been welded with 4043 aluminium welding rod which contains silicon
The anodising process reacts with the silicon and gives a nasty appearance
Paint it with cheap and cheerful satin black spray, scuff up the tank with scotchbrite for better paint adhesion
You’ll have no issues with heat rejection, and it’s easy enough to touch up any stone chips
Simon @ SiFab.co.uk
