are you cleaning the part good before going to another compound ... and what set up are you using .... black /sisal brown / sprial white loose cotton ...... or you can use white on a sprial .... them little compound will work but you will not be happy you may want to order a set from caswell and try them ... and when you buffing try to go side to side instead of up an down ...... on your buffer you can stack 2 8" buffs with no problems