I'm re-painting some old windows, and as I was sanding up, some putty fell out (two pieces - about an inch long each).
I looked in my toolshed, and there it was, winking at me: Ronseal wood filler (white). I wetted a palette knife, and applied the mixture. I'm now waiting for it to dry (two hours). I then plan to sand it down and paint as if nothing had happened.
Will this come back to haunt me? I didn't want to use putty because of the drying time.