What is a "tuflite" surfboard and why are they universally hated among surfboard repairmen?

Hey Los Angeles/Orange County:
Upload a photo in the Rogue Wave app to get free quotes for ding repair, pay through your phone, and see a list of partner shops where you can conveniently drop off and pick up your surfboard!
https://www.roguewaverepairs.com

List of tools and supplies I use can be found here:
https://www.roguewaverepairs.com/prod...

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Chapters:
0:00 What is a Tuflite?
1:04 Surface prep
1:44 Mixing epoxy filler
2:14 Filler application
2:43 Shaping the filler
3:30 Lamination patch
4:04 Feathering fiberglass patch
4:32 Hotcoat (still just 2 part epoxy)
5:00 Painting (color matching)
6:55 Before and after