Sorry if it's been asked before - had a quick search and couldn't find anything - We've been decorating and had new flooring fitted. Took the skirting boards off and refitted them. All good except one length runs behind a radiator. What is the best way of filling the gap between wall and skirting, you can see it if you look along the wall, as the skirting is higher than the bottom of the radiator and obviously too close to the wall to get the gun right the way along. Thanks in advance.