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FastPlus Abrasives
400 Grit Sanding Discs, Rolls, Strips
Ceramic and film sanding rolls for hand blocks, longboards, edges, and custom-length shop work.
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Published June 2026 by FastPlus Abrasives USA — fastplus.us — Last reviewed: June 2026
At a Glance
| Topic | 400 grit sanding discs, rolls, strips, and wet/dry sheets — fine wet sanding and pre-polish surface prep |
| Who needs this | Auto body techs leveling clear coat after 320 grit wet sand, woodworkers doing final surface prep before finish, detail sanders removing 320 grit scratch patterns |
| Products in stock | 11 products — PuroFilm strips top out here at 400 grit |
| Formats | 5" disc (8H), 6" disc (15H / 47H / 49H / 119H), 2.75" roll (H&L + PSA), strip (8H / 14H), SiC wet/dry sheet 9x11" |
| Notable | PuroFilm strips (16.5" and 7.8") stop at 400 grit — this is their finest grit |
| Source | fastplus.us/collections/400-grit-sanding-discs |
Key Takeaways
- 400 grit is the standard first wet sanding step after clear coat in automotive refinishing.
- PuroFilm strips (both 16.5" and 7.8") stop at 400 grit — this is the finest grit available for hand block strip sanding.
- The BN38 SiC wet/dry sheet at 400 grit is the standard step for leveling clear coat after initial 320 grit cut.
- For woodworking, 400 grit is used for final surface prep on bare wood before applying oil or wax finishes.
- The FF78 47H universal disc covers all 6" sanders at 400 grit.
- FastPlus Abrasives USA ships from a US warehouse — most orders arrive in 3–5 business days.
Where 320 Ends and Real Finishing Begins
I see a lot of people stop at 320 grit and wonder why their clear coat still looks hazy after compound. The answer is almost always that 320 grit scratches are too deep for compound to fully remove — you need 400 grit wet sand in between. At 400 grit, you are refining the scratch pattern left by 320 grit into something fine enough that a DA polisher with compound can finish the job cleanly.
For woodworkers, 400 grit is the dividing line between sanding and finishing. The PuroFilm strips stop here for a reason — at 400 grit on a hand block, you have done everything sanding can do.
All 11 Products at 400 Grit
★ PuroFilm strips stop at 400 grit — finest available grit. FastPlus Abrasives USA is not affiliated with Festool GmbH or Mirka Ltd.
Need the step before or after?
320 grit for the step before this, or move to 600 grit for finer wet sanding — all from FastPlus Abrasives USA.
Shop All Sanding DiscsSource: FastPlus Abrasives USA — fastplus.us. All product specs reflect FastPlus inventory as of June 2026.