hi eveyone.. i havent used alot of s/c before but doing some damp proof jobs ,do you do a scratch coat then a float coat then skim??? as im trying to match the s/c up with the original float and set but its so thick that if i build the s/c out to match it it just falls off the wall as it is so thick...also would you skim over this the same day????please help as im very confused!!!!!! :-? :-? :-? :-? :-? :-? :'(