The arches on my 987 had begun to succumb to the road rash around the bottom of the arch/sill area where many cars seem to - I often see it in cars offered for sale, in far worse a state than mines was. Seeing as mines was not so horrendous, and my car is not metallic, I thought I’d give a home repair a go. Being a flat colour with no flake, a paint match was far easier to achieve from an aerosol can.
Here is how I went about it:
Bilthamber Deox Gel
All purpose cleaner/degreaser
Guards Red (or applicable) aerosol
Any good lacquer
Firstly, I washed the entire car, however you can just wash the area if you like. I did it to reduce swirls and marring when masking.
Once I had dried the car, I lightly sanded the area and wire brushed the exposed metal. You can go far more harsh on the areas than I did, and probably should - however it did not affect my end result.
Once wire brushed, smear deox gel onto any areas of exposed metal, and leave to sit for at the very least the minimum time stated on the container. Once it has been left to work in, wire brush the areas with deox gel applied, and remove the gel.
Once the deox gel has been washed off, thoroughly degrease the area, and let dry. Then mask the vehicle up extremely well. I had my wheel full lock to the left to allow access, then masked the entire wheel up. Further I masked up almost the entire arch, half the door and the sill. I used a kitchen roll on the edges of where I intended to spray. This ensured an even blend of paint, and was extremely effective. Also, I advise laying something on the floor underneath where you are painting - unless you like the idea of a PTS garage floor.
Next I laid down 3 layers of Zinc Primer, followed by 4/5 coats of Guards Red, and then around 6 coats of lacquer, to protect from stones in the future. I’m well aware this is not the most effective method, nor am I by any means a professional vehicle repair tech - however as a cheap, temporary home repair, I am delighted with the results.
Unfortunately I didn’t take pictures during the process, only before and afters.