So, I have to dye the back and sides of my lockdown mandolin, but keep the neck untouched. It will be a tru oil finish, starting with their sealer/filler. Would it be sensible to give the neck a coat of sealer/filler before I stain the back and sides, in order to reduce the risk of the dye spilling onto the neck? Its going to be a solvent based dye, not water based, since that's what I have.