I have tried using Flexible Gap Polyfilla to fill a gap between a door frame and the wall. The gap is 6-8 mm wide, and I stuffed the cavity behind it with bubble wrap.
The problem is that the filler doesn't seem to set properly. After twelve days, it is still soft enough to make a permanent indentation in it with my fingernail.
I enquired about this to the manufacturers, who say that it is supposed to be fully cured in a week
Furthermore, I had made a practice run filling a gap in an old wooden bookcase, which after a week I put outside in the garden. After a heavy downpour of rail, that filler appears to be dissolving. Yet this product is advertised as being suitable for indoor and outdoor use.
Is this generally thought to be a reliable product? Can anyone recommend something better, or suggest how I might be using it wrongly?
Perhaps I should mention that I am not an experienced DIY-er, and this is the first time I have visited this newsgroup.
Andy Kirkham