Hi. We bought a 1930's house last year and every room needs doing. We started with my son's room and took it back to bare walls and got it all plastered etc. I wanted to put new skirting boards in and someone said try uPVC as its less maintenance, so we did. My brother told me to bond it to the walls with White Gripfill. I did but found that it has come unstuck in some places. We had some new windows put in the other day and the fitter said about using a good silicone to bond stuff together including skirting boards as the silicone is flexible. Is this a good idea? It sounds ok. I got to put some more boards in soon in our toilet under the stairs and don't want to use Gripfill again.