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Do they have 16grit? Not a floor in 10 years I havent been able to strip with 16. Problem to with some of those rental sanders is they operate at such a high rpm, it melts the wax/shellac,crap to the paper more than it strips it off. Why belt sanders can be effective BC they roll at a slower speed than your others. Stick with the big belt sander for everything you can get, crosscut if you have to edges,closets,halls,etc, then follow with finer paper to take those out after wax is off. Good luck to you, even for us professionals not much you can do other than change the paper and a lot of elbow grease. PM me if you have further issues I can give you a call.
do the big box stores rent out a variable speed walk behind drum sander