Matsui PrintGen Retarder MG | Anti-Drying Additive to Extend Open Time for Water-Based Screen Printing Ink

Also Included in Matsui Quick Additive:

Retarder MG is one of four components in Matsui Quick Additive (WB1028), a pre-blended 4-in-1 formulation that also includes Softener MG, Fixer WF-N, and Thickener B. If your ink prep already involves adding Retarder MG along with Softener and Fixer, Quick Additive delivers all three in a single pour at 7-9% by weight – saving time and eliminating multiple measurements. Use standalone Retarder MG when you need precise control over open time without affecting other ink properties.

Benefits at a Glance:

• Extend screen open time to prevent ink from drying and clogging in the mesh during production
• Prevent lost detail, ghosting, and production stoppages caused by premature ink drying
• Essential additive for fine mesh printing (230+ mesh), halftone work, and detailed designs
• Critical for low-humidity shops, arid climates, winter heating, and high-altitude environments
• Functions as a mild viscosity reducer at higher concentrations for improved ink flow
• Propylene glycol-based formula – non-toxic, food-grade safe, and easy to handle
• No pot life limitation – mixed ink stays usable on your production schedule
• Works across every Matsui water-based ink system including bases, pigments, ready-for-use colors, discharge inks, and specialty products
• OEKO-TEX Standard 100, CPSIA, and HR4040 certified – meets all major brand RSL requirements
• PVC-free formulation with easy water cleanup

Matsui Printgen MG Safety Data Sheet

Matsui Printgen Technical Data Sheet

What does Matsui Retarder MG do?

Matsui Retarder MG slows the drying rate of water-based screen printing ink in the screen mesh.

This extends the “open time” — the window during which ink stays wet and printable — helping prevent:

• Clogged mesh
• Lost detail
• Ink drying in the screen
• Production interruptions

It improves print consistency, especially in dry shop conditions.

How much Matsui Retarder MG should I add?

Standard usage: 1–5% by weight

Recommended guidelines:

• 1–2% – Moderate humidity conditions
• 2–3% – Fine mesh or high-detail printing
• 3–5% – Low humidity or arid environments

In extremely dry conditions, usage can go up to 25%, but higher percentages will significantly extend cure time.

Always measure by weight for accuracy.

Will Retarder MG affect cure time?

Yes.

Because Retarder MG slows water evaporation, it will extend cure time.

• 1–3% – Minimal impact
• Above 5% – May require slower belt speed or increased dryer temperature

Always perform a wash test before full production.

Can I use Retarder MG with discharge inks?

Yes.

Retarder MG is compatible with all Matsui discharge bases. It extends open time during the discharge activation window and helps maintain consistent ink flow throughout the run.

What is the difference between Retarder MG and spraying water on the screen?

Water dilutes ink, weakening binders and reducing wash fastness.

Retarder MG modifies evaporation rate from within the ink system without diluting the chemistry. It delivers controlled, consistent performance instead of inconsistent spot spraying.

Is Retarder MG the same as PrintGen MG?

Yes.

“PrintGen MG” and “Retarder MG” are the same product (SKU RM0590). Matsui also refers to it as “Slow Drying Additive” in some documentation.

Can I use Retarder MG and Softener MG together?

Yes.

Many printers combine:

• Retarder MG (1–3%) – Extended open time
• Softener MG (1–3%) – Improved mesh lubrication and softer hand feel

Alternatively, you can use Matsui Quick Additive, which contains Retarder MG, Softener MG, Fixer WF-N, and Thickener B in one pre-blended solution.

What Matsui ink systems work with Retarder MG?

Retarder MG is compatible with all Matsui water-based systems, including:

• 301 Series bases
• Neo Pigments
• EasyPrint
• Stretch
• Alpha Series
• Infinity Colors
• Discharge Bases
• White Bases
• Under Base Blocker
• Puff Base
• PrintGen NTF
• Specialty inks

Is Matsui Retarder MG safe for children’s apparel?

Yes.

Retarder MG is:

• OEKO-TEX Standard 100 certified
• CPSIA compliant
• HR4040 compliant
• PVC-free

It meets restricted substance requirements for children’s products and major apparel brands.

What is the best shop humidity for water-based printing?

Matsui recommends maintaining shop humidity at 35% or higher for optimal open time and ink performance.

In environments consistently below 35%, combining Retarder MG with a humidifier delivers the most stable results.