there is a trouble with what the finish is on the seat at the start
textured or smooth flat ?
if you buff it up the seat can warm up and melt a bit which will turn the texture different again
it is a fine art - you have to try and learn and also depends on if you are worried about messing up the seat ?
got pic ?
![Huh ???](http://www.radbmx.co.uk/forum/Smileys/smilies/huh.gif)