Ok you know u get a plain double glazed window well i do them no probs but occasionally u get windows that have plastic sections glued or taped on to make up square patterns like u get with led dressing but in white plastic well i knocked part of the plastic dressing off that makes the squares.Did i explain it any better lol.
they are nightmare, u get to know which windows to careful with.I was going to use no more nails double sided tape, any good, or too thick?