What can I use to seal my floor that will botclean and fill in cracks?

Hi Debbie,

Here's a discussion on ThisOldHouse that might interest you. In the discussion, one of the participants states that the stain is actually a sealer, but you should still use 3 coats of poly. Others have different ideas so this will give you options. Wishing you the best.

https://www.thisoldhouse.com/discussions/topic/to-seal-or-not-to-seal-hardwood-floor

You don't want to fill in the cracks, unless you mean insuring the cracks get covered with sealant. There are liquid formulas applied with a mop similar to a swiffer. You make long, continuous strokes after applying a specified amount on the sanded and tack clothed floor. Don't leave a speck of dust, or it will feel gritty, beneath the sealant. It should require 3 applications for best coverage. You'll be able to walk on it after 3 days of optimal dry time/conditions.

If you're referring simply to a hardwood floor cleaner, many people swear by Bona.

The cracks, or gaps between the planks allows expansion and contraction. I vacuum my plank floors before I mop them.

They usually use sawdust to fill the gaps in hardwood floors, in really old wide plank floors they used rope.... https://www.youtube.com/watch?v=S-MsW89nyfM or they make wood filler for hardwood floors you can get at home depot or lowes.

https://www.youtube.com/watch?v=7focJeab0pM