Water-Based Screen Printing Made Easy with the Rudy Press

Water-based screen printing gives your apparel an incredibly soft retail hand and feel, but running it on a manual press can be a real challenge. If you have ever tried running premium water-based inks on a manual press setup, you already know the production headaches. The ink dries out in your screen, your arms wear out, and keeping consistent print pressure across a long run is a challenge. The Rudy Press squeegee and flood bar attachment changes that, bringing automatic-like consistency directly to your manual press.

We break down a real-world print job using The Rudy Press Squeegee/Flood Bar Attachment: how to set up your screen, choose the right water-based screen printing supplies, and handle difficult fabrics like 100% polyester without losing your mind or ruining your garments.

Setting Up Your Screens and Inks

For this production run, we are printing on two completely different fabrics, which is a classic test for any busy print shop. Each material requires a distinct approach to make sure your water-based screen printing ink clears properly, holds vibrant color, and feels soft to the touch. The first garment is an A4 performance fabric made of 100% polyester. Because polyester is highly prone to dye migration when heated, you must use a specialized blocker underbase to keep the colors true. The second garment is an Allmade organic cotton t-shirt. This premium fabric features a smooth 30 singles printing surface, meaning you can print directly onto the shirt fabric without needing any heavy underbase layers.

Your screen mesh selection is critical when printing water-based screen printing inks. For this job, we are using a 156 standard mesh for both our blocker base and our white underbase. For our detailed top overprint, we step up to a 196 mesh. Choosing the correct mesh ensures you deposit enough ink to cover the fabric fibers completely without flooding the fine details of your design. If you go too low on your mesh, you will puddle the ink. If you go too high, the water-based chemistry will clog before you finish your first dozen shirts.

Our ink lineup features the Green Galaxy high solids acrylic, also known as HSA, system. If you want prints that are bright, opaque, and incredibly soft, this is the collection to load into your frames. To clear these inks efficiently, we are running standard 70 durometer squeegees for our white base and gold overprint, and a sturdier triple durometer squeegee to force our thicker blocker ink through the mesh. Here is the breakdown of the high solids acrylic inks loaded into our screens for this project:

• Underbase Blocker: Green Galaxy Gamma Blocker Black HSA Water Based Ink to stop dye migration on the royal blue polyester garments.
• White Base: Green Galaxy Comet White HSA Water Based Ink for a crisp, bright white underbase and standalone print.
• Gold Overprint: Green Galaxy Galactic Gold HSA Water Based Ink, which is a hybrid high solids and low solids ink that runs a little thinner for effortless clearing.

Why Water-Based Printing Is Hard on a Manual Press

Why does water-based screen printing have a reputation for being tough on a manual press? It usually comes down to simple ink management and physical leverage. When you use premium HSA water-based screen printing inks, they start out beautifully creamy in your screen. However, as the water component evaporates into your shop air, the ink starts to stiffen and dry out.

On a traditional manual press, printers typically try to conserve ink by putting only a small dollop in the screen. With water-based screen printing, this is a major mistake that guarantees a clogged stencil. Less ink in the screen means it dries out much faster, making your prints rough and difficult to pull. When the ink dries inside your mesh, it blocks the open image area and ruins your print consistency for the rest of the job run.

The Rudy Press completely changes this dynamic. Because of its unique mechanical design, you can load a large volume of ink into the screen, just like you would on an automatic press. Keeping a large reservoir of ink keeps the chemistry wet, creamy, and easy to shear throughout your entire production cycle. Even if the ink begins to stiffen slightly after sitting, the mechanical leverage of the Rudy Press gives you the extra pressure needed to clear the ink through the mesh cleanly without breaking your back.

RELATED: Rudy Press Screen Printing FAQ: Everything You Need to Know

Managing Your Flood and Print Strokes

One of the best design features of the Rudy Press is its integrated wing flood bars. When you use a standard manual squeegee, the ink naturally spreads out toward the left and right sides of your screen frame. This displaced ink dries out quickly on the dry mesh, requiring you to constantly stop production, grab an ink spatula, and scrape it back to the center. The wing flood bars on the Rudy Press keep the ink pooled directly in the center of your design. This concentrated ink volume prevents premature drying, saves your stencil, and keeps your print station clean.

Pro Tip: Always keep your screen flooded when it is resting between shirts. If you leave the mesh open and exposed to the shop air while you load a new garment, the water-based screen printing ink will dry in the open image areas. Raise your screen, flood it back, and let the squeegee float and rest in the back position to seal the mesh with a layer of wet ink. If your other screens are sitting idle during a run, keep a spray bottle nearby to lightly mist the screens with water and keep the ink wet.

Your stroke technique also plays a massive role in water-based screen printing success. When printing manually, most screen printers prefer a traditional pull stroke to maintain a low squeegee angle and clear the mesh entirely. Pushing water-based ink manually is incredibly tough unless you are using a very thin, low solids formulation because you cannot get the blade angle low enough with your wrists.

The Rudy Press allows you to push with absolute ease. Instead of the traditional manual sequence of flooding forward, lifting, moving your squeegee back, and then pulling the print stroke, the Rudy Press simplifies the physical motion into a streamlined pattern. You flood forward, and then you simply print back. This smooth, ergonomic motion reduces body fatigue, eliminates wrist strain, and increases your hourly print output significantly.

Step by Step Production on Cotton and Polyester

We start our production run by heating up our platens. Having warm platens helps flash the water-based ink quickly between color stations. First, we print our organic cotton shirts. Because cotton fibers absorb water-based screen printing inks beautifully, we do not need the blocker underbase at all. Water-based ink typically does not clear entirely on the first pass, so we run a smooth double print stroke with our Comet White base to ensure a thick, opaque deposit. The Rudy Press clears the screen beautifully on the second pass, allowing the high solids white ink to stack nicely on the fabric surface for a high-quality retail finish.

Next, we print our Galactic Gold overprint. Because this gold ink is a hybrid medium solid formulation containing about 20 percent high solids and 80 percent low solids, it is naturally thinner than the white underbase. We loosen the adjustment knob to raise our flood bar height slightly and lower our squeegee angle to lay down a bit more volume. Because we are moving quickly through the rotation, we can double stack this gold overprint with a single pass on the second turn without even needing a manual flood stroke between passes. Printing water-based ink with the Rudy Press feels just like printing on a ROQ automatic press.

When transitioning to our 100 percent polyester performance shirts, we apply a light mist of water-based pallet adhesive to the platen surface. We recommend using Water Based Pallet Adhesive alongside a quick spray mist to keep the slick synthetic fabric locked securely in place during the print rotation so your registration stays perfect.

We then load our thick Gamma Blocker Black ink. Because this ink is incredibly dense and designed to create a physical barrier against polyester dye sublimation, we use our triple durometer squeegee to force the blocker through our 156 mesh screen. We run three passes with the blocker ink, flash it, and then print our Comet White underbase right on top.

 

Applying the blocker underbase prevents the royal blue dyes of the performance shirt from bleeding into our white ink, ensuring our final print remains bright, clean, and completely free of muddy discoloration. Take a look at the side-by-side comparison below to see exactly how much clarity you gain by using a dedicated blocker layer vs skipping it entirely.

RELATED: How to Test for Dye Migration Before You Print

As you can see on the right side of the sample, the blocker underbase locks out dye migration completely, leaving you with exceptionally bright whites and punchy golds. Here is a close-up look at how that finished print registers right on top of the synthetic fabric weave.

Once your final pass clears beautifully, your garments are ready for the conveyor belt. When running water-based runs through your shop, ensuring a stable, total cure is what guarantees that soft-hand longevity your customers expect out of retail apparel.