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You can also go with Mr. Hobby (Gunze) Mr. Dissolved Putty if you want your putty liquified but don't want to mess with mixing acetone or anything into it. It does have a slight shrinkage equivalent to most other putties, but it's not bad and is very easy to work with and sand.
I use both Mr. Dissolved Putty and Squadron White putty mixed with acetone, and both work quite well
I've found combing Mr Dissolved Putty with Mr surfacer works really well. Put tape on either side of the gap, fill with the dissolved putty, smooth down, remove tape and when dry put a thin film of Mr surrfacer over it to cover any shrinkage.
Pretty easy.
Matt