Gamma,
No, it's just that paint tends to dry in after a few months of drying, and also the woodgrain reacts to drying or moisture. Those two things make the woodgrain reappear after a while in paintwork that was first perfectly smooth. That then giver verry smal 'grooves' in de bottom, which increase water resistance. There are several way's to counteract this 'grooving', I have always useed this method and am verry happy with it.
Secondly you can sand the edges of the hull to a realy rasorsharp edge using this method. That also decreases water resistance.
I make the hull realy smooth with spray-putty and sanding over the fabric. After painting I sand the hull down to a matt finisch with 600 grain waterproof sanding paper. Then a verry thin layer of water stay's 'stuck' to the hull, and you get a water on water friction, which is less then water on hygh gloss paint.
Reinhard,
Nicht so laut, sonnst hört man das ..