hardwood flooring and filling the gaps

Hi guys,
really good forum you have going here.

my questions are
1) i want to use polyurathane 2 pack (mainly because i want high gloss floors, what is a good brand... but not too expensive, what do the pro's use?
this is one of our final renos before we move in so money is rather tight now so i dotn want somethin too e
2) our floorings isnt too crash hot and has a few gaps up to 5mm deep that need to be filled, a friend has recommended to use the trowel in filler that you mix the wood shavings with.
i looked at the bona mix and fill. would this be suitable. is there a cheaper option of the same thing.
any help will be greatly appreciated.
regards
Charls


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