I have narrow gaps between the floor (Amtico) and the skirting boards (not over 1.5/2 mm) that I would like to fill but I'm not sure what to use. The floor is quite elastic so ideally I'd need something that sticks and that is also flexible and doesn't crumble. Being able to paint over it is a bonus, but the main goal is to fill those gaps. What's the best product that I could get in the UK to get the job done?
If that is a floating laminate floor it really should be left alone. Scribing and cutting the baseboard (skirting) would have been best, but to caulk the gap, which is the other alternative would bond the flooring to a degree to the flooring and not allow it to move as it needs. The shoe mold is an idea that is used but has is drawbacks, it is typically nailed at an angle into the floor, in the case of floating floor, it would be in essence, nailing the flooring in place. If it is nailed only into the skirting then its holding power is minimized, and possibly will leave the same gap that you are holding objection too. Besides in my opinion, adding another piece of molding will detract rather add to the look.
Now, if it is solid floor, or glue down, and not a floating laminate, I would a good grade of latex caulk to caulk it, but be very careful about the cleaning off of the excess.