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I like to use a hand pad to scuff up and denib between coats of polyx, I'm not sure how effective it will be after it has fully cured though. I normally do it after 3 or 4 hours of application. Chuck it on a orbital sander to make it a quick job. I think I got this from a Peter Parfit video.
This kind of thing: https://www.selcobw.com/products/painting-decorating/sand-paper-abrasives/professional-assorted-grade-hand-pads-pk-3
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Also, there is one slightly noisy board where there’s a tongue and groove butt joint that’s floating between joists that I forgot to glue. NB it was only those joints that I glued. Is it a fools errand to try and drill some tiny holes and syringe some glue in to try and stop it moving/making noise?
Normally my solution to this would be to water down PVA glue to make it pretty slack, usually a 2:1 PVA to water ratio then pour it over the joint and spend a good 10 minutes doing a kind of idiotic birdie song shuffle on the boards either side of the joint to work it in between the boards. Once this is done you can put as much weight as possible on the join to try and hold it all down while the glue sets. However it would be a lot of cleaning up on a finished surface and I'd also be terrified of doing that and not quite getting it all up.
Another thing you could try is dovetailing some 18ga pins in (assuming you have access to a 2nd fix nailer). By dovetailing I mean fire in 2 pins close to each other each at at an opposing 30 to 45 degree angle. This way the pins work together to hold down the board (assuming they both hit the board and joist). You will have to fill the holes and make good.
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Hovis
Bobbo
@Nef
Osmo Polyx question.
I’ve put 2 coats down on the beech floor. It looks great, but it’s not as even as I’d hoped and we were probably a bit keen with the amount of traffic it had (I’m still trying to erase the memory of my wife putting two stonking dirty foot prints on it).
Can I rub it down with anything to help clear it up before I give it another coat?
Also, there is one slightly noisy board where there’s a tongue and groove butt joint that’s floating between joists that I forgot to glue. NB it was only those joints that I glued. Is it a fools errand to try and drill some tiny holes and syringe some glue in to try and stop it moving/making noise?