On Monday, March 28, 2016 at 12:08:22 PM UTC-4, Ramy wrote:
I often hear that sanding is only a temporary solution, and after couple of years the gel coat will lift again and now you have a thinner gel coat layer and wider cracks. If so, why sanding unless you try to sell your glider?

Ramy

So you can save up for a full refinish. A "flattening sanding" helps with the aerodynamics followed by a good wax/polish can extend the life of what you have. A full refinish is not cheap.