Took about two and a half cans. Helpful if you know someone in the trade who can get it and has the right gun to attach it to so that you can spray it inside the chassis members.
Thanks for those. Should have made it clear that I need a company that will do the work for me. I live on a 20% hill which gets busy so I don't have the facility to do the work myself.
My Defender was Waxoyled 10 years ago. 15 ltrs inside and outside the chassis, bulkhead and all the inside panels removed and sprayed underneath.
Still no rust anywhere