Gelcoat oxidation comes in degrees, and the degree decides the method. Mild responds to polish by hand. Moderate needs a machine. Severe needs careful wet sanding before anything else will touch it - and wet sanding gelcoat is a one-way street, so it needs someone who has done it before.
Three metres up, flat, and facing the sun all day. Almost no owner can inspect it properly, so it is routinely years worse than the walls. It is also where solar panels, air conditioners, vents and hatches are mounted, each one a seam that has to stay sealed.
The join between the automotive front and the coachbuilt body is a seam, a change of material and usually a change of colour all at once. It collects dirt, it is awkward to reach, and it is where a rushed job is most obvious.
Once gelcoat has gone porous it stops shedding dirt and starts absorbing it. Diesel soot, road film and mould get into the surface, which is why an old motorhome can be washed thoroughly and still look grey.
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