A nipper gets the part off the runner. It is the sanding stick that decides whether anyone can tell where the nub used to be. The GodHand Kamiyasu Migaki sanding sticks are the hobby's default answer to that second job — a ladder of foam-backed grits, around $22 for the assortment, that takes a fresh cut down to a surface paint sits on invisibly.
We catalogued the Kamiyasu range against the sanding-stick field using our bench methodology. Here is what the foam actually does for you, the grit ladder that matters, and who is better off with a cheaper stack of files.
The one-line verdict
If you build styrene kits and you care what the nub looks like under paint or a gloss coat, the GodHand Kamiyasu sticks are the easy buy. The foam cushion is the whole feature, and around $22 for a spread of grits is the right money.
Skip them only if you exclusively snap-build and never intend to paint — a bare nub on unpainted plastic is a more forgiving problem than one hiding under a color coat.
What the foam actually does
Kamiyasu translates roughly as "paper file," but the important word is foam. These are adhesive-backed abrasive sheets mounted on a flexible foam core, not rigid sandpaper glued to a hard stick. The cushion lets the grit conform to curved armor, cylinders, and fillets instead of cutting flats into them the way a hard file or a stiff nail-buffer does. That is the entire trick: you can knock a nub off a rounded shoulder without leaving the tell-tale flat spot that screams "sanded here."
The assortment ships in a few thicknesses — 2 mm, 3 mm, 5 mm — and the 3 mm stick is the everyday workhorse: firm enough to control, soft enough to follow a curve. Thinner sticks reach into recesses; thicker ones back up broad panels. They can be used wet or dry, and a fresh sheet cuts alarmingly fast for something this gentle on the shape underneath.
The grit ladder that matters
The assortment runs foam grits from #400 up through #6000 (GodHand sells even finer polishing grits separately). The ladder logic is simple and worth learning:
- #400 / #600 — knock the nub flush and remove the stress-whitened crescent left by the cut.
- #800 / #1000 — erase the coarse scratches the #400 left behind.
- #2000 / #3000 — bring the plastic back toward its molded sheen, ready for a satin or gloss coat.
- #4000 / #6000 — pre-gloss polish for clear parts, canopies, and metallics.
The one rule: never skip more than a single step, or the coarse scratches telegraph straight through the finish. And know when to stop — under a matte topcoat you can quit around #800–#1000, because a flat coat hides fine scratches. Only bare-plastic display pieces and gloss finishes need the full climb. The sprue-and-gate anatomy in our 3D field guide shows exactly where the nub sits before you start, and how to remove nub marks without stress whitening covers the two-stage technique these sticks finish.
Where they pair
The Kamiyasu is the finishing half of a two-tool cut — the nipper leaves a tiny nub, the stick makes it disappear.
- Run them behind a GodHand SPN-120 on light-colored runners and a quick #600 tickle is often all that is left to do — see our God Hand SPN-120 review.
- Behind a half-price cutter like the DSPIAE single-blade nipper — our full review has the details — you will lean on the sticks a touch more, which is exactly the trade you made to save money.
- For the whole cut-and-sand station ranked by budget, see our best nippers for Gunpla and best sanding sticks guides, and the tool roundups hub for where sanding fits the wider bench.
The trade-offs, honestly
The value is real, but it is not free. Foam nail buffers and wet-dry sandpaper are cheaper by the square inch; you are paying for graded, hobby-cut foam sticks and the convenience of a matched ladder. The sheets also wear — the adhesive-backed grit loads up with swarf and dulls, and the finest grits are the first to give out, so treat the #4000 and #6000 as consumables and rinse them to stretch their life.
They are also not a seam filler. Sanding removes material; it does not close a gap. Deep seams and sink marks still want capillary cement or putty first, then the ladder to blend. And there is the overshoot trap: climbing all the way to #6000 on a part destined for a matte coat is effort you will never see.
Getting the most out of them
- Wet-sand. A drop of water floats the swarf, stops the grit clogging, and produces a cleaner cut — and it keeps fine styrene dust out of the air, which matters at any enclosed bench.
- Work in one direction, check under raking light, then rotate ninety degrees and go again so you can see stray scratches.
- Prime to reveal. A thin coat of primer/surfacer exposes every scratch and missed nub you would otherwise only find after the color coat. Sand, prime, inspect, spot-sand — that loop is what separates a clean build from a blotchy one.
One safety note that has nothing to do with fumes: sanding plastic makes fine dust, and styrene dust is not something to breathe in a closed room. Wet-sanding, a damp cloth, or a quick pass with a vacuum keeps it down.
The verdict
The GodHand Kamiyasu sanding sticks earn their spot on the bench for one design choice: foam under the grit, so the abrasive follows curves instead of flattening them. Pair them with any decent single-blade nipper and nub cleanup stops being the step that gives your build away. Buy the assortment for the ladder — you will use #400 through #1000 constantly, and be glad the finer grits are waiting the day a gloss coat demands them. Nub cleanup is the unglamorous rite every builder shares; it is why "mind the nub" is a bench in-joke worth wearing on a shirt.
A quick, honest note: some links on this page are affiliate links. As an Amazon Associate we may earn a commission when you buy through them — at no extra cost to you. It never changes the price you pay.
Questions builders ask
What grits do the GodHand Kamiyasu sanding sticks come in?
The common assortment runs foam grits from #400 up through #6000, with even finer polishing grits sold separately. Use #400–#600 to knock a nub flush, #800–#1000 to erase those scratches, and #2000–#6000 only when you are heading for a gloss or bare-plastic finish. Under a matte topcoat you can stop around #1000, because the flat coat hides the rest.
Are foam sanding sticks better than sandpaper for Gunpla?
For curved armor, yes. The foam core lets the grit conform to rounded surfaces, so you remove a nub without cutting a flat spot into the shape. Flat sandpaper and rigid files are still better for genuinely flat panels and long edges — most builders keep both, and reach for the foam sticks on anything with a curve.
Should you sand nubs before or after painting?
Before. Sand the bare plastic, then prime to reveal any scratches or missed nubs, spot-sand, and only then paint. Sanding after the color coat means cutting through your paint and re-priming that spot — far more work than getting the surface right up front.
Can you use GodHand sanding sticks wet?
Yes, and you usually should for the finer grits. Wet-sanding floats away the swarf, keeps the abrasive from clogging, cuts a touch finer, and controls dust. Dry sanding is quicker for the coarse #400–#600 knock-down work; switch to wet as you climb the ladder toward a polish.
