I think the scothbright thing is a mixup that comes from rub-on wax techniques.
The scotchbright pad creates friction and heat that will melt the rub-on wax into the pores without an iron. Some ppl use a cork instead.
But the brush thing is to get into the groves of a structured base. The scrapper just makes it flat. But when it's completely flat, it creates suction...like 2 pieces of glass stuck together...and will reduce your speed. For example, there are metal brushes or machines that will make "crevices" in your base. Depending on conditions, there's an optimal "patern" like linear, criss-cross, whatever that racers apply before a competition. The nylon brush gets those crevices to reveal themselves after wax fills them up.
Last edited by rasmasyean; 01-24-2010 at 04:18 AM.