I don't know know for sure that it broke down but I suspect that it did. Whenever I used it on the spinner I always seemed to get a very fine finish, finer than the 1200 grit US that it should. When I used it by hand I got what I think was closer to what was intended. (
Added note: this is/was an impression, as I have no way of measuring such a finish.)
I also use Track's Clean and Smooth, a 1500 grit equivalent to Matte Finish's 1200 grit. It does break down similarly to Brunswick's Rough Buff. If I use Clean and Smooth over 4000 grit Abralon I get a polished ball.
That said, I still have some Clean and Smooth and some Matte Finish. Got them from Buddies when I learned Ebonite's Powerhouse would not be marketing them anymore. They still advertise they have 5 oz bottles for $9:
http://www.buddiesproshop.com/product/2545/PowerHouse_Matte_Finish-_5_oz_-_Discontinued_-_WHILE_SUPPLIES_LAST.htmI'd get some if I were you. Otherwise you'll probably need to buy Valentino's 3000 FEPA grit pads. They're 1500 grit US. That's the closest I've seen except for some woodworking places that has P2500 grit, but they're hard to find.
Here's a 5.5"x 9" Rynowet 50 pack sheets P2500 Grit for $18 + shipping and a Wet-Dry Paper 9"x11" 50 pk - 2500 grit Silicon Carbide for $27 + shipping
http://www.eastwoodco.com/shopping/product/detailmain.jsp?itemID=11004&itemType=PRODUCT&iMainCat=1217&iSubCat=1225&iProductID=11004--------------------
"None are so blind as those who will not see." Edited on 2/3/2009 8:53 PM
Edited on 2/4/2009 10:53 AM