i opted for POR 15 on the whole under body, inner and outer guards, wherever there where rust repairs and i think thats about it. went the gloss black as you can see, ppl who have used it before know its a bloody process. this was my least favourite part of it. i brushed it on as it was easier for me considering it drys quite flat without brush strokes. i decided to do it in sections as it was easier. the front half first then the rear followed by the guards.