wood filler and clear finish for oak floor?
Go Get some latex base red oak floor filler And trowell fill the whole floor , I am A pro tacomahardwoodfloors.com have a look , Heres the deal if you don't trowel the whole floor you won't have as good a chance to see how it sands out , The filler will remain in low spots and show you rough sand paper marks , And why would you skip a step in the process ,
Are you useing a professional hardwood floor belt sander ? Or what ?
You should be roughing off with 36 grit , then 50 grit to get the 36 marks out , then full trowel fil then 80 grit to get the filler out then vibe sand all the edges with 80 grit and hand sand where you can't reach ,then get a 500 watt light and shine it acroos the floor from a low angle and get in front of it and look for sandpaper marks and fix as necessary then Vac , then go clean the vac and vac again , then just go with polyurethane , Natural stain sealer can be put on but why waste your time if you want the natural color , Poly will build a little finish up on the first coat , and sealer stain won't it will just seal the wood a little , so just go with three coats of poly , Buff between coats with a 180 screen