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

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.