harmy, U mention wet-sanding. So the sand paper u should be
getting will be green in color. There are some which are
"golden"colour.Those are not suitable. How many do u need? Last
time in my final year project, i may have some sandpapers left, but
need to dig them out... SMS me
But anyway, if you are looking for even finner grit, chances are
they came mostly in liquid form.If you are ok with it, you may find
it easier to buy them.
Anyway u want to recon your balls ah? 
