How big are the gaps? 1-2mm
Are you sanding the floor or is this retro maintenance? Retro Maintenance
What have you tried and how has it failed? Nothing yet as everthing i pick up says not for this application (but everything else!)
Hi
Normally gaps would be filled before sanding and then sanded back to be smooth and then over coated with a finish. Bona Mix and Fill good for 1-2mm gaps, if you can put up with the smell Lecol 5500 will do larger gaps up to 5mm, but both of these need the wood dust to be mixed in.
Floors bounce, and move due to foot traffic, moving furniture and weather expansion / contraction.
There no such thing as a product that can be guaranteed to with stand years of the (above) type of movement.
Best things is to take up boards and clamp then together to reduce the gaps. If you take the boards up you could add celotex insulation between the joist which will prevent air drafts.
You could also use the other side of the boards as the face thus showing new unmarked boards which will require about 10% of the sanding effort.
For gaps of up to 4mm I've used LECOL 7500 FILLER, mixed with the saw dust from sanding. I did it in 2004 and it still looks great. I have a through lounge and did the whole lot with it, with varying gaps, and none have deteriated. For gaps of 5mm upwards, I filled with bits of wood.
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