A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
My only current use is on my transfer bash plate. It gets all of the abuse. The raptor was applied by riccy of this parish and it has just sat there and gone meh at everything.
Regarding the chassis I would recommend hot dip galvanizing because it will also protect the inside and in addition to great cohesion it also protects electrolytical. Painting on top of zinc dip galvanized surfaces is not so easy. You might want to lightly abrade or sweep blast the surface and then apply 125um surface tolerant high solid epoxy and on top 50um aliphatic polyurethane.
Your zinc primed chassis could be different products. If it is zinc rich epoxy primer or zinc ethyl silicate primer then I would recommend products of the same manufacturer as the primer with an intermediate coat of 110um (4.4mils) two pack epoxy polyamide and a top coat of 50um (2mils) two pack aliphatic polyurethane coating.
The Bitumastic paint is basic and is available from any builders merchants or Screwfix/Toolstation. The price in the UK is around the £20 per 5 litres.
From memory painting zinc requires either ageing, around 6 months, or specific primers. I left the zinc as was. A galvanized surface is around 0.008" thick and should last 2-3 years per thou. Obviously a lot longer if you protect it.
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