Some while ago I laid some pine floorboards. Due to shrinkage, there are some gaps of varying sizes that have opened up between the boards. These vary from no gap to a matter of a few millimetres.
Can anyone give me some advice as to how to fill/ what to fill these gaps with to get a smooth floor. Some ideas I have had include wood filler, papier mache, silicone (possibly too soft). My intention would be to fill the gaps and then re-varnish the floor.
Thanks