- I am retired but need to help a mate replaster his Cottage. I have a 16 inch marshalltown but after watching YouTube I'm unsure as to whether I should use the sponge float system and something like the refina 900mm spatula and the plastic fimishimg trowel or the s*p*r*lex finishing trowel to make life much easier on my joints ( he does say he prefares his surfaces wallpapered )any advice on what to buy will be very much appreciated thank you