About half of the fascias in the picture aren't repairable, holes in the textured sections, cracked and broken off sections.

Acetone is available from Bunnings in the paint section but any hardware or paint store should have it. It is used in fibre glassing.

Use a rasp to shred up the plastic into a glass jar or bowl, add small amounts of acetone and mix until you get the desired consistancy. The paste can be used as a glue and filler.