hi all, Can any one help ive got a job to do for a client its on tarmac about 600 meters my trouble is i cant seam to get the pressure right when cleaning tarmac with the whirlaway floor machine ,Ive tryed half pressure on cold,also full pressre on cold also tryed useing hot machine on a low pressure but all ways it seams to either leave rings on tarmac or small pot holes from the rotary arm i thing you experience guys no what im trying to say, also theres a small amount of paint that needs removing advice on both matters would be greatly appreciated thanks in advace!!!!!