Tell us about your Jimny and post some pictures! 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.
clean em up and paint on some buzzweld RCP (rust control primer) then CIO (chassis in one top coat). They do an aerosol spray cavity wax which is good for hard to reach places also.
While your at it take the headlights out and check behind them as thats usually a bad spot
J999 MNY, ULYSSES M18 VVT with ITB's Dyno tested at 130hp