howdy chaps,i got a little bit of smooth rendering to do tomorrow around a window of an extension....it only 8 ft high by 10 ft long with the window in the middle...just want to know if i scratch it in the morning,would i be able to top out in the afternoon?i reckon the scratch will only take an hour to put on at the most.......im going for a 4 1 then a 4 1 1 with a drop of waterproofer chucked in on my top coat.....