Gaps in floorboards

[paneer]

The gaps in my floorboards are driving me nuts. It's very draughty.

Has anyone tried this to fill the gaps? Any comments?
stopgaps.com

[WowOoo]

I've seen those. Meant to be good. We have a sawdust (from local timber merchant for free) and some gluey stuff that a plasterer did for us.
But, he said those stopgaps are better and directed us to the website.

The glue has shrunk a bit and soon I will vacuum it up and be with gaps again - so a waste of time with the glue but a cheap, short term solution.