I discovered Mr Surfacer a few years ago, great stuff - grey and white versions, in three thicknesses, it's like a paint that dries in 5 mins and is sandable. Awesome stuff, but you need laquer thinner/acetone to clean up, and you really shouldn't breathe any of that stuff. but it is a perfect thin "liquid putty". Instructions are all in Japanese, NOTHING on the laebl is English except "Mr Surfacer". But o instructions needed: paint it on, clean brush with laq thinner. sand in a few mins.