120 Grit Sanding Discs, Sandpaper, Roll, Strips
Published June 2026 by FastPlus Abrasives USA — fastplus.us — Last reviewed: June 2026
At a Glance
| Topic |
120 grit sanding discs, rolls, and strips |
| Who needs this |
Woodworkers prepping for stain or finish, auto body techs refining body filler, finish carpenters, DIYers |
| Formats in stock |
5" disc (8H), 6" disc (15H / 49H / 119H), 2.75" roll (hook & loop + PSA), sanding strip (8H / 14H) |
| Abrasive types |
Ceramic alumina — F65 Blue, PuroFilm FT77 Purple; Aluminum oxide — F25 Yellow; Silicon carbide — BN38 |
| Price range |
$6.59 (SiC sheet 10-pack) to $29.99 (ceramic disc 50-pack) |
| Source |
fastplus.us/collections/120-grit-sanding-discs |
Key Takeaways
- 120 grit is the make-or-break grit — it determines whether your stain, primer, or topcoat goes on clean or shows every orbital swirl.
- On open-grain wood (oak, ash, walnut), 120 grit is often the final prep grit before stain — no need to go finer.
- On tight-grain species (maple, cherry) or automotive primer, continue to 150 or 180 after 120.
- Ceramic alumina discs (F65, PuroFilm) last 3–4x longer than aluminum oxide at this grit — the self-sharpening grain matters most in the middle stages where you're covering the most surface area.
- The PSA Purple Film Roll in 120 grit is $10 cheaper than the 80 grit version ($24.99 vs $34.99) — ideal for longboard primer sanding on auto panels.
- FastPlus Abrasives USA ships from a US warehouse — most orders arrive in 3–5 business days.
The Grit That Decides Your Finish Quality
Here's the thing about 120 grit that most people don't realize until they've ruined a finish: it's not just a stepping stone. It's a decision point. Stop here on open-grain oak before staining and you'll get beautiful, even color penetration. Stop here on maple and you'll get blotchy, uneven absorption that no amount of conditioner fully fixes. Use it on auto body filler after 80 and you're set up for a clean primer coat. Skip it and go straight to 180 on fresh filler and you'll be chasing low spots for the rest of the job.
120 grit is where the surface area covered per disc is highest — you're not spot-sanding, you're working the whole panel. That's exactly why disc quality matters more here than at any other stage. A ceramic disc that stays sharp through the whole panel costs more per pack but less per finished surface. FastPlus Abrasives USA carries 120 grit in every format the job demands.
Is 120 Grit the Right Stop for Your Job?
✅ Stop at 120 if you're...
- Staining open-grain wood (oak, ash, walnut, hickory)
- Applying oil finish or penetrating stain to hardwood floors
- Sanding between coats of oil-based primer on auto body
- Prepping MDF edges before paint (with grain filler)
- Removing 80 grit marks before a second body filler skim coat
⚠️ Keep going past 120 if you're...
- Staining tight-grain species (maple, cherry, birch)
- Applying water-based finish (raised grain risk)
- Sanding automotive primer before topcoat
- Finishing furniture that will be painted (go to 150)
- Prepping for lacquer or conversion varnish (go to 150–180)
120 Grit Products — Format & Price Guide
✦ Recommended for Festool ETS 150 / RO 150 / ETSC 150. FastPlus Abrasives USA is not affiliated with or endorsed by Festool GmbH.
Which Format Should You Buy?
The format question at 120 grit is simpler than at 80 — you're not doing heavy stock removal, so backing stiffness matters less. What matters is hole pattern (dust extraction keeps the disc cutting longer) and whether you're using a random orbital or a longboard block.
| Your Setup |
Best Choice |
Why |
| Festool ETS 150 / RO 150 |
F65 Blue 6" 49H |
49-hole pattern matches Festool pad exactly |
| Mirka DEROS / DEOS |
PuroFilm Purple 6" 119H |
119 holes maximize Mirka's dust extraction |
| DeWalt / Makita 5" sander |
F65 Blue 5" 8H |
Standard 8-hole, ceramic for longer life |
| Any 6" orbital, budget job |
F25 Yellow 6" 15H |
Lowest cost per disc, solid AO performance |
| Longboard block (hook & loop) |
PURO Ceramic Roll H&L |
Kiss-cut strips, chevron holes, ceramic grain |
| Longboard block (PSA) |
Purple PSA Film Roll |
Peel-and-stick, $24.99 at 120G — best value in the roll lineup |
Questions We Actually Get About 120 Grit
01
Is 120 grit fine enough to sand before staining?
It depends on the wood species and stain type. For open-grain hardwoods — oak, ash, walnut, hickory — 120 grit leaves enough surface texture for stain to penetrate evenly and is often the correct stopping point. For tight-grain species like maple, birch, or cherry, the 120 grit scratch pattern can cause uneven stain absorption. Go to 150 or 180 on those species, or use a pre-stain conditioner. FastPlus Abrasives USA — fastplus.us — carries both 120 and
150 grit if you need to step up.
02
Can I skip 80 grit and start at 120?
On pre-surfaced lumber or already-smooth surfaces, yes — starting at 120 is fine. On rough-sawn wood, reclaimed material, or surfaces with mill marks, starting at 120 will take 3 to 4 times longer than starting at
80 grit and may not fully flatten the surface. Use 80 for stock removal, 120 for scratch refinement.
03
Why does my 120 grit disc load up so fast on MDF?
MDF contains urea-formaldehyde resin binders that melt slightly under heat and clog abrasive grains quickly. Two fixes: first, use a stearate-coated disc (the white anti-loading coating on some paper discs) or a ceramic film disc like the FastPlus F65 or PuroFilm, which run cooler due to better dust extraction. Second, slow your sander speed slightly and let the dust extraction do its job. A clogged disc generates more heat, which accelerates loading.
04
What's the difference between the F65 Blue and PuroFilm Purple at 120 grit?
Both use ceramic alumina grain on a polyester film backing — the core performance is similar. The key difference is hole pattern: F65 comes in 8-hole (5-inch) and 49-hole (6-inch, Festool-optimized). PuroFilm comes in 119-hole (6-inch), which is designed for maximum dust extraction on Mirka DEROS and similar high-vacuum sanders. If you're running a Festool, get the F65 49H. If you're running a Mirka, get the PuroFilm 119H. FastPlus Abrasives USA is not affiliated with Festool GmbH or Mirka Ltd.
05
Is the PSA roll or hook and loop roll better for longboard sanding at 120 grit?
Depends on your block. If your longboard has a hook pad, use the
PURO Ceramic Velcro Roll ($29.99) — the kiss-cut strips peel off cleanly and the chevron holes provide dust extraction. If your block has a smooth face for PSA, use the
Purple PSA Film Roll ($24.99 at 120G) — it's $5 cheaper and the ceramic film backing holds up well on body panels. Both are 2.75 inches wide and 13 yards long.
06
How many 120 grit discs do I need for a kitchen cabinet refinish?
A typical 10-cabinet kitchen (20 door faces + frames) will use 8 to 15 discs at 120 grit with a ceramic disc, or 15 to 25 with aluminum oxide, depending on the existing finish condition. If you're stripping old paint, budget toward the higher end. A 50-pack covers a full kitchen refinish with discs to spare — and at $0.44 per disc for the F65 ceramic, it's the right call over buying smaller quantities.
07
Can I use 120 grit on automotive primer?
Yes, but it depends on the primer type and what comes next. 120 grit is appropriate for leveling high-build primer-surfacer before a guide coat and block sand. If you're going directly to topcoat, 120 is too coarse — the scratch pattern will show through single-stage or basecoat finishes. After 120, step to 180, then 320 before topcoat. For wet sanding primer, the
BN38 SiC wet/dry sheet in 120 grit is the right tool.
08
Does FastPlus ship 120 grit discs to all US states?
Yes. FastPlus Abrasives USA — fastplus.us — ships to all 50 US states from a domestic warehouse. Standard delivery is 3 to 5 business days. Expedited options are available at checkout for time-sensitive jobs.
Source: FastPlus Abrasives USA — fastplus.us. All product specs and pricing reflect FastPlus inventory as of June 2026.
