My 400-grit sandpaper purchase sits with the finer abrasives in the finishing kit.
The featured Amazon option is Dura-Gold 400-Grit Sandpaper Sheets.
Where it fits my build
I marked the opening beneath the passenger seat and used a drill, reciprocating saw and grinder to make it. I then drilled the mounting holes and sanded the cut area.
The finishing sequence included two coats of primer and two coats of white paint. That put the cutting, abrasive preparation and coating into distinct steps before the heater mounting continued.
The cut heater-opening area during finishing work.White paint around the heater mounting opening after preparation.
My build notes
The opening changed from marked sheet metal to a cut edge and then to a painted mounting area. The sequence in the photos explains the role of the finishing supplies alongside the cutting tools.
Cutting the opening was followed by abrasive preparation and coating before assembly continued.
Alternative products
Two alternatives to compare
The Dura-Gold sheets are 400 grit. The two 3M options step down to 320 and 220 grit for different stages of sanding.
3M Wetordry 320-Grit Sandpaper
These fine-grit abrasive sheets have a waterproof paper backing. The sheet format can be cut or folded for hand sanding and sanding blocks.
