I wanna to take out my frets and make my bass fretless what I need to put instead of the frets? I understund that I need to fill the slots with a wood (maple\ebony\rosewood) but some bassist told my that Jaco pastorius put a boat glue or something wird like these in the fret slot. so...what i need to do? what i need to fill the slots? I have a rosewood fingerboard ypu have a good guide that explain how to mage your bass fretless?