Fine · Smoothing and preparing
Sandpaper P400
Primer / paint. Smoothing primer surfacer and primer, preparing for the top coat.
Roughly equivalent to 320 Grit (US CAMI standard). Why the numbers differ
01 · Where it fits
Where P400 sits in the sequence
Before
Pre-sand with P320 – the jump to P400 is no more than double, so the scratches disappear.
Fine range
P220–P400: Intermediate sanding before oil, wax and varnish, smoothing primer surfacer and primer, paint preparation. The most-used group in any workshop.
After
Carry on with P600 until the surface is as fine as the next job needs.
All grits in the Fine range
In the KORNDEX system:Paint preparation · Sand primer surfacer & primer P320–P600Paint preparation · Key paint & plastic P400–P1000Paint preparation · Fine-sand wood P240–P400
What P400 is used for
Car & paint
Sand primer / primer surfacer · Keying paint
Metal
Refine the surface
Plastic
Paint preparation
Primer
Sand primer surfacer
02 · Buy
Products in P400
- Bestseller
- P80–P600
- Grit
- 150 mm
- Diameter
- 50 pcs
- Contents
€0.50 / pc · incl. VAT, plus shipping
- Bestseller
- P240–P1500
- Grit
- 150 mm
- Diameter
- 10 pcs
- Contents
€1.59 / pc · incl. VAT, plus shipping
- Bestseller
- P80–P400
- Grit
- 150 mm
- Diameter
- 50 pcs
- Contents
€0.50 / pc · incl. VAT, plus shipping
- Bestseller
- P400–P2000
- Grit
- 150 mm
- Diameter
- 10 pcs
- Contents
€1.49 / pc · incl. VAT, plus shipping
- P400–P2000
- Grit
- 230 × 280 mm
- Dimensions
- 25 pcs
- Contents
€0.80 / pc · incl. VAT, plus shipping
- P80–P400
- Grit
- 70 × 420 mm
- Dimensions
- 25 pcs
- Contents
€0.92 / pc · incl. VAT, plus shipping
03 · Know-how
FAQs about P400
What is P400 sandpaper used for?
Primer / paint: Smoothing primer surfacer and primer, preparing for the top coat. Typical for Car & paint, Metal, Plastic, Primer.
Is P400 coarse or fine?
P400 belongs to the fine range (P220 to P400): smoothing and preparing. The higher the number, the finer the grit.
Which grit comes after P400?
After P400 comes P500 or – from our range – P600. Never more than double the number per step – that way the finer grit removes the scratches of the coarser one.
Should P400 be used wet or dry?
Dry, with dust extraction – up to about P600 that is the standard today: faster, and no water in the metal or wood. Mesh discs and multi-hole patterns stop P400 from clogging.
Which grit comes before P400?
Before P400, sand with P320 (or finer). Jump straight to P400 from too coarse a grit and you won't get the scratches out.
Related guides
Car & paint
What grit sandpaper for car paint?
From body filler to finish: the grit sequence for a paint repair – and why you never skip a step.
P80 → P120 → P180 → P240 → P320 → P400 → P600
Read · 2 min
Car & paint
What grit before painting?
Primer surfacer with P320 to P400, old paint with P400 to P600, plastic with P320 to P400 – depending on substrate and paint.
P320 → P400 → P600
Read · 1 min
Abrasives
Sandpaper for random orbital sanders
Diameter, hook-and-loop, hole pattern: what has to match – and which grits belong in the workshop.
P80 → P120 → P180 → P240 → P320 → P400
Read · 2 min
Not sure P400 is right?
The finder asks about material, machine and goal – and tells you the grit and product.
Start the abrasive finder →