Without UV protection the underside fades, chalks and oxidises - and because nobody looks at the bottom of a ski until it is on the trailer nose-up, it is usually well advanced before it gets noticed. It hurts how the ski looks and what it is worth.
Polytec and similar moulded hulls are not gelcoat and cannot be wet sanded and cut back the way gelcoat can. Getting this wrong is not a setback, it is permanent - which is why we identify the material before we choose a process.
Most owners flush the engine religiously and give the hull a quick hose. Salt that dries on the surface keeps drawing moisture back against it long after the ski is home, and that is what accelerates the surface breaking down.
Bunk carpet holds grit, and every load and unload drags it along the same strips of hull. Combined with sun damage on the same surfaces, the underside takes more wear than the deck ever does.
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