we have aluminum trac in aft cabin windows, took most of the day to cut, fit and install. The black plastic trac was cut, fit and installed in the salon and forward cabin in 1 afternoon. Just a whole lot easier to work with. may not last as long as aluminum but heck the last stuff made it 32 years, if this last that long I'll be 84. It may out last me.

The only downside with the plastic trac is it definitely takes 2 people to install because it is so flexible, we caulked all the trac's and when I tried to put 1st set in by myself I made 1 heck of a mess
1978 Aft Cabin
Twin Chrysler 440's
Fox Road Marina
My Father once told me "if you ever need a helping hand, just look to the end of your arm!"