Iwata Eclipse HP-CS Review: The Forever Airbrush

The Iwata Eclipse HP-CS is a gravity-feed, dual-action airbrush with a long following among model builders and miniature painters, and Iwata itself lists it as one of its two most popular choices for beginners, noting that "many Iwata fans will tell you that this is their favorite airbrush and the one they use everyday." This review works from Iwata's own product page, instruction manual, parts list, FAQ and warranty, plus ANEST IWATA's Japanese product page, rather than first-hand use: what the HP-CS is designed to do, how Iwata says to set it up and look after it, and exactly what to check before you buy a used one.

The one-line verdict

If you want one airbrush that covers fine lines through wide coats, with every wearing part still sold by the maker, the Eclipse HP-CS is the safe choice, and a well-kept used one is one of the easier airbrushes to buy second-hand because its wear parts are cheap and in stock.

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The builders who should hesitate are beginners on a tight budget who are not yet sure airbrushing will stick; more on the cheaper option below.

Iwata Eclipse HP-CS at a glance

Source: Iwata-Medea's Eclipse HP-CS product page and FAQ, the Eclipse Series instruction manual and master parts list (document ECL101-IM-SHP), and Iwata's nozzle and needle part pages, checked September 2026; the air-inlet thread is from ANEST IWATA's Japanese Eclipse page. Iwata's own documents differ on the cup: the product page says 0.24 oz (7 ml) and the manual says 1/3 oz.

A correction on nozzle size. An earlier version of this review described the HP-CS as a 0.35 mm brush. Iwata's US product page, manual and parts list give no nozzle diameter at all; they describe the E3 head system, which the parts list shares between the HP-CS and the HP-BS (nozzle part I6042). The only diameter on an ANEST IWATA site is on its Japanese page, which lists 0.3 mm for both the HP-BS and the Japan-market HP-CS-JP, and 0.5 mm for the siphon-feed HP-BCS. This review uses Iwata's figures.

What it is built to do

Iwata describes the Eclipse series as high-flow airbrushes that can "atomize a wider variety of liquids with less need for reducing or thinning," with a spray range from a controlled fine line to a controlled wide spray. The manual puts numbers on that range: for fine lines, hold the brush between 1/16 and 1/2 inch from the surface; for wide coats and backgrounds, between 1/2 and 6 inches; and the maximum usable line width is about 2 1/2 inches.

The build details are practical. The compression-fit nozzle drops into place under the head cap rather than threading in; Iwata says "there is no threading required nor recommended," and replacing it means lifting the whole piece out and dropping in a new one. The cutaway handle exposes the back of the needle so you can clear a clog at the tip without removing the handle and needle. Iwata describes the needle as stainless spring-steel that resists breakage and the needle packings as solvent-resistant, and every Eclipse ships with a head cap spanner and Iwata Lube. Iwata's FAQ says Iwata brand airbrushes are made in Japan.

Our interactive 3D field guide labels every part of a gravity-feed brush in plain language.

Setting it up: pressure and air

Iwata's product page gives an optimal working pressure of 25 to 35 psi for the HP-CS, and the manual's setup steps say to adjust the pressure to between 25 and 35 psi. The manual goes further: working pressures "generally vary between 25 and 55 psi," 35 psi or above is preferred to get the most from the Eclipse, thicker paints and larger amounts of paint need more pressure, and you should never exceed the brush's 98 psi limit. Iwata's FAQ adds two practical points: you want a compressor with air regulation, and you should set the pressure while air is flowing, because the reading at rest is the compressor's built-up pressure rather than what you spray at.

That affects your compressor choice. Iwata's manual says its entry-level Smart Jet compressor gives the Eclipse about 20 to 25 psi, while its low-to-high pressure compressors can supply up to 50 psi. Our guide to setting up your first airbrush and our compressor guide cover the rest. On paint, Iwata's advice is to thin with the paint's proper solvent, filter non-airbrush paints through nylon mesh, and build colour with repeated passes; our guide on how to thin paint for airbrushing has the ratios and the milk test.

Ventilation is not optional. Iwata's manual says to always spray in a well-ventilated area, use a respirator suited to your paint, and wear eye protection.

Cleaning and care

The manual's routine for the gravity-feed Eclipse is simple: between colours, dump the leftover paint, rinse and wipe the cup, then spray cleaner until it runs clear. Spray water or the right solvent through it before each session, and after each session raise the pressure, spray cleaner briefly and clean the needle if needed. Two rules are in capitals: never soak the whole airbrush in any liquid, and never store it with paint or cleaner in the cup.

To clean the needle, unscrew the handle, loosen the needle chucking nut and pull the needle straight out; the manual says the likeliest moment to damage it is when it passes through the main lever and the needle packing screw. Lubricate the needle and main lever regularly with a light coat of Iwata Lube, and never with light machine oil or WD-40, which Iwata says make the needle stick in the packing. A cleaning pot and solvent kit plus the routine in how to clean an airbrush will keep it spraying cleanly.

Why it lasts

The case for the Eclipse as a long-term tool rests on Iwata's own support. Iwata warrants its airbrushes against manufacturing defects for five years from the date of purchase, excluding needles, nozzles, O-rings and internal packings, which Iwata treats as wear parts. Its master parts list offers every part of the HP-CS as a replacement except the body itself, and Iwata's own store listed the E3 nozzle, the E3 needle, the PTFE needle packing set and the head cap in stock when checked in September 2026. Iwata also runs a service centre in Portland, Oregon for North American repairs. For where the HP-CS sits against the rest of the field, see our airbrush shortlist.

The trade-offs, honestly

No brush is universal. The HP-CS ships with a single cutaway handle; Iwata sells a preset handle, which limits how far the trigger can be pulled back, as an optional extra, and its parts list for the HP-CS includes no air-adjustment valve on the brush, so you set pressure at the compressor's regulator. It also comes with one head system. Iwata's Japanese page says the Eclipse BS, CS and BCS can be converted between its 0.3 mm and 0.5 mm sizes by swapping the nozzle, nozzle cap and needle together, but Iwata's US FAQ does not recommend conversions and says a conversion voids the warranty.

For very fine freehand work, Iwata's finer-detail airbrushes are designed for thinner lines; our Iwata Custom Micron vs H&S Infinity comparison covers that end of the market. And there is the price: Iwata's own store listed the HP-CS at $205, out of stock, when checked in September 2026, and Iwata points buyers to its local dealers for more competitive prices.

Who should buy the cheaper brush instead

If you are airbrush-curious but not committed, start with a lower-priced gravity-feed brush such as the Iwata NEO CN, which Iwata describes as designed for "soft, effortless coverage at low air pressures" and lists alongside the Eclipse as a popular beginner choice. Our budget airbrush roundup covers the whole under-$100 field, and our Iwata Eclipse vs H&S Evolution comparison sets the Eclipse against a German rival. When the habit sticks, the Eclipse is the obvious step up.

The verdict

The Iwata Eclipse HP-CS earns its reputation on the points Iwata can document: a high-flow, compression-fit head that covers fine lines through wide coats, a 25 to 35 psi working range that suits a regulated hobby compressor, a five-year warranty, and wear parts that Iwata still stocks. Buy it if you are committed to airbrushing and want one brush for most jobs. Buy a cheaper brush first if you are testing the waters, or buy a used Eclipse carefully, using the checks below.

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Buying it second-hand

The HP-CS is a good airbrush to buy used for the same reason it lasts: everything that wears is sold separately by Iwata, and the parts that fail are small and inexpensive. The checks below come from Iwata's own manual, troubleshooting table and FAQ.

1. Confirm the model. Iwata's FAQ says its airbrushes are engraved with the model number on the side, and head parts are model-specific and not interchangeable. Look for HP-CS; an HP-BS is a gravity-feed Eclipse with a smaller 1/16 oz cup, an HP-BCS is a siphon-feed brush with a larger E5 head, and the Eclipse Takumi is a side-feed model. Check that the cup lid is there, since Iwata sells it as a separate part.

2. Inspect the needle. Iwata's manual warns that the needle and nozzle "are very delicate" and that "even a slight bend on the tip of the needle can adversely affect the spray pattern." Ask for a close, sharp photo of the needle tip. A bent needle is the cheap problem: Iwata's E3 needle costs $11.75 on its own store. The expensive mistake is pulling a badly bent needle back through the nozzle, which Iwata says can damage the nozzle, so do not force a bent needle out.

3. Judge the nozzle from how it sprays. Iwata's FAQ says nozzles and needles "will wear out over time" and names what damages a nozzle: cross-threading, over-tightening, dropping the airbrush, and forcing a needle or tools into the nozzle. Ask for a short video spraying water or thinned paint, and compare what you see with Iwata's troubleshooting table: bubbles in the cup point to a loose head cap or nozzle cap, a badly seated nozzle, or a cracked nozzle; a double line points to a bent needle, debris on the nozzle or a cracked nozzle; skipping and spattering often come from dried paint or the wrong pressure. Iwata's FAQ also says not to separate the two parts of the HP-CS nozzle, so a nozzle that has come apart should be replaced. The E3 nozzle is $31.50 on Iwata's store.

4. Check the seals. The needle packing, the air-valve piston packing and the O-ring are the soft parts that age, and Iwata's troubleshooting table lists a dried-out air-valve packing O-ring as a cause of spattering, fixed by lubricating the trigger housing. Iwata sells the PTFE needle packing set and the air-valve parts separately, and its warranty excludes O-rings and internal packings as wear items.

5. Look hard at the body and cup. Iwata's parts list marks the airbrush body as not available as a replacement part, and it lists no separate cup for the HP-CS, only the lid. Dents, cracks or damaged threads on the body or cup are permanent, so they are the one reason to walk away from an otherwise cheap brush.

6. Ask what comes with it. A new Eclipse ships with a head cap spanner and Iwata Lube; both are easy to replace, but their presence suggests a careful owner. Ask whether the brush has been converted to a different head size, because Iwata says a conversion needs the needle, nozzle and nozzle cap together and voids the warranty.

How to judge the seller's claims. "Barely used" should come with the needle photo and the spray video. "New nozzle fitted" is only reassuring if it is a genuine Iwata E3 part. "Still under warranty" deserves a question to Iwata before you rely on it: the warranty runs five years from the date of purchase and never covers the needle, nozzle, O-rings or packings. Price the brush as a body plus parts; a needle and nozzle from Iwata add $43.25 to the cost of a tired one.

Shopping second-hand? Find a used Iwata Eclipse HP-CS on eBay — Used airbrushes may need new needle, nozzle or seals — parts are still sold new; condition is the seller's claim. Affiliate link: we may earn a commission from eBay, at no cost to you.

Sources

• Iwata-Medea, "Iwata Eclipse HP-CS Gravity Feed Dual Action Airbrush" (ECL4500) product page and technical info, iwata-airbrush.com, checked September 2026, with Internet Archive copies from 2019, 2020 and 2024.
• Iwata-Medea, "Operating Instruction Manual," Eclipse Series (ECL101-IM-SHP), including the troubleshooting table, master parts list and five-year warranty, iwata-airbrush.com, checked September 2026.
• Iwata-Medea, part pages for the E3 nozzle (I6042), E3 needle (I6172), PTFE needle packing screw set (I7251) and head cap (I6031), and the FAQ and repair service pages, iwata-airbrush.com, checked September 2026.
• ANEST IWATA Corporation, Eclipse series product page (specifications for HP-BS, HP-BCS and HP-CS-JP), iwata-airbrush-jp.com, checked September 2026.