While doing some work on the car I noticed that the underbody is in a need of attention. Being a bit OCD I decided that I'll carry out all the work myself, I figured that even if I did only a one or two square feet a week the car would be all done in few weeks (well before winter).
Here is the plan:
I'll be starting with sections that are the worst, removing the heavy rust mechanically (wire brush, various wire wheel brushes + drill) then I'll use Deox Gel (by Bilt Hamber) followed by degreaser, couple coats of self-etching primer with high zinc content and top coat.
I'll be going for "factory" look - everything white except for suspension/steering parts and fuel tank.
Small parts that can be easily removed will be soaked in Deox C.
All cavities will be treated Dynax S-50 (also by Bilt Hamber - apparently outperforms by miles waxoyl and other products)
I won't be using the typical black under seal, I don't like the idea that the car could be rusting underneath the under seal without me knowing about it/without visual signs. Once finished I'll treat the underbody with Dynax UC (see through anti-corrosion wax).
Here are some pictures of what the underbody looks like now, when I bought the car back in January all the rust was classified as surface rust - hope it's still the case and that welding won't be needed.
Some supplies, all I need now is determination and elbow grease!