Pelletized caustic soda is available from Bunnings in different sized tubs.
Correct ABS plastic welding rod is far easier to use than cut up bits of fascia and is reasonably cheap.
Where to get it.... http://lmgtfy.com/?q=http://www.miplastics.com.au/
The correct colour for GTS fascias is Dulon Suede Black.
With the correct tools and ABS rod you get a much neater finish....
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