I had some extra Dynamat left over and decided to partially cover the trunk lid. I hope this will make the car quieter for when I get to the point of installing a sound system and subwoofers.
First, I used painter’s tape to make a template.
Then I carefully cut out the shape I want with an exacto knife. In later shapes, I decided it was easier to instead mark where I wanted to cut with a sharpie and cut the shape later. That way I don’t risk cutting into the paint.
Use the template to cut out your Dynamat. Then flip the shape over to get its mirror image for the other side of the trunk:
I’m pretty pleased with the final result. Not perfect, but good enough for me.