On Dec 8, 4:53*am, andyv wrote:
I rather like the floorboards in my kitchen as they show evidence of
200 years of alterations. I want to leave them exposed and painted. I
don't want to strip and varnish them as I think they are too rough to
get looking good.

These are tongue and groove in three different widths and running at
strange angles to one another. I've spent some time repairing various
sections which had large gaps but I now need to seal up the cracks
between the boards as a lot of the tongues have been damaged, but what
to use that will make them airtight and paintable and look OK? Would
decorator's filler from a mastic gun work? I'm concerned that anything
I do might be very difficult to correct once it's done.

I'm prepared to experiment with different techniques on the floor in
the loft.

I would just use painters caulk in a tube, floors expand-contract and
move, anything hard will pop out.