We had a new oak parque floor fitted 18 months ago, with an oil finish. We are developing small cracks between blocks – will Treatex® Hardwax Oil fill these gaps?
Treatex® Hardwax Oil will not fill between the blocks, it will run down between the blocks. It sounds like you need a stainable filler but beware filling can make a mess of a floor if done incorrectly. Usually floor would be filled first, sanded right back and then finished. Filler can alter the appearance of wood.