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Try to break down the putty work to several steps, when using putty to alter/add new part or shape. Use coarse sand paper like 300-600 grit to achieve the basic shape every time you add putty. When the final shape is obtained, use finer sand paper like 600-1000 to remove the scratches. If the desired part is thick, epoxy putty is more appropriate, but it takes time to harden. Polyester putty is also good for building a thick volume, and it hardens very quickly.
I don't think primer would smooth the surface, unless it's thoroughly sanded, but it will make the surface texture consistent.
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