This is the back of the body


Should i be grain filling for a smooth finish?. The body of FS-1 is made of basswood. I checked the Internet it says basswood is not open pore and doesn't require filling but this body has this vertical streaks like thing running in same direction of the body. As in below photo


So i am not sure if sanding is just enough to get a smooth Feel after gloss /sating rattle can 1k PU



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