Finished Trimming Plenum

The high-temp epoxy that I used on the plenum needs to be post-cured in order to withstand the high temperatures it will be exposed to after engine shutdown.  I took it down to the Tech Shop and used their large powder coating over to cure it at 150º for three hours.  The heat substantially softened it and it flattened out a bit in the oven.  After I brought it home, it didn’t really fit the baffles correctly and would have cracked if I tried to force it into position.  I set up my space heater over each side and heated the plenum past 150º and it softened right up.  I then pushed it into position and screwed it down.  This worked beautifully, and the plenum now fits the baffles really well.

I finished trimming around the edge and then sanded the plenum flush with the baffles.  I still need to sand and fill the plenum in preparation for paint, but I think the fabrication is finally done.

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