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Polyester resin (AKA "fiberglass resin") eats foam. Epoxy resin does not eat foam. Polyester resin stinks. Epoxy does not. Epoxy costs four times as much.
Google "Gougeon brothers book" for a free PDF on wood and fiberglass boat construction. The Gougeon Brothers manufacture West System epoxy, the stuff that I used to seal my topper.
An aero topper is really a funny shaped boat installed upside down on a truck. The main difference is that the topper keeps out water falling down from above.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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