Inktek Gray Super Blocker Plastisol Ink – The Ultimate Solution for Preventing Dye Migration

Inktek

Inktek Super Blocker Plastisol Ink

The Inktek Gray Super Blocker is a high-opacity gray plastisol underbase ink engineered to fully block dark garment colors from migrating into your print. Whether you’re printing on black, charcoal, or deep-toned polyester-blend shirts, Gray Super Blocker lays down a clean, neutral foundation that keeps your top colors crisp and true — shot after shot.

⬛ Maximum Opacity
Blocks dark substrate colors completely
🎯 True Color Foundation
Top inks print exactly as intended
🧵 Cotton & Poly Blends
Formulated for today’s garment mix
🖨️ Smooth Printability
Consistent lay-down on fine to coarse mesh
⚡ Flash & Stack Ready
Flashes cleanly, doesn’t ghost on platen
🏭 Part of the Inktek LB Series
Mixes and stacks with the full Inktek lineup
🚚 Same-Day Shipping on orders before 3:30 PM CT Mon–Fri  ·  Free Shipping over $200

Price range: $45.99 through $166.99

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Description

Block It Cold. Print It Bright.

Dark garments are the toughest substrate in screen printing. Inktek Gray Super Blocker was built for exactly this fight — a neutral gray underbase that delivers maximum dye-migration resistance and true-tone color reproduction on every shirt in the run. Stop fighting your substrate. Start printing with confidence.

MAX
Substrate Opacity
280°F
Full Cure Temp
86–160
Mesh Count Range
3 Sizes
Quart · Gallon · 5-Gallon

Why Gray Super Blocker?

Total Dye-Migration Block

Polyester fibers release dye under heat. Gray Super Blocker’s formula creates a barrier between the garment and your top colors — eliminating the pink or gray cast that ruins dark-shirt jobs.

Neutral Gray Base

Gray (not white) is the correct underbase for dark shirts. It absorbs less light and allows your top colors to read truer to proof — especially important for bright whites, pastels, and process-style prints.

Clean Flash Performance

Flashes quickly and completely. No ghosting on the platen, no wet-on-wet smearing. Lay down your underbase, hit the flash, and keep printing without slowing your press.

Consistent Printability

Smooth, buttery consistency holds its body on the screen without becoming soupy in a heated pressroom. Prints cleanly through 86 to 160 mesh — high detail to heavy coverage, same ink.

Available Sizes

  • QQuart (32 oz) — Ideal for shops running limited dark-shirt jobs or testing the ink for the first time
  • GGallon (128 oz) — The workhorse size for regular production printing on dark garments
  • 55-Gallon Pail — High-volume shops and contract printers who run black and dark shirts daily

How to Use Gray Super Blocker

Step 1 — Print Underbase

Print Gray Super Blocker as your first-down color through 86–110 mesh. Use a 70/90/70 durometer squeegee for a clean, even lay.

Step 2 — Flash Cure

Flash at 180–220°F surface temp until the ink is dry-to-touch. Don’t over-flash — you want good wet adhesion for your top colors.

Step 3 — Print Top Colors

Print your Inktek LB Series colors (or any compatible plastisol) wet-on-flash over the blocked underbase. Colors will pop exactly as intended.

Step 4 — Full Cure

Run through the conveyor dryer at 280°F internal ink temp. Check with a donut probe or wash-test strips to confirm full cure before shipping.

Gray vs. White Underbase — Which Should You Use?

Use Gray Super Blocker When…
  • Printing on black or very dark shirts
  • You need dye-migration resistance
  • Colors need to appear as close to PMS as possible
  • Printing brights, pastels, or whites over dark substrates
Use White Underbase When…
  • Printing on medium-tone garments (royal, red, forest)
  • Dye migration is not a concern (100% cotton)
  • Maximum brightness is the priority over color accuracy
  • Your customer spec requires a white base

Gray Super Blocker vs. Standard Underbase Inks

Feature Inktek Gray Super Blocker Standard White Underbase Generic Gray Ink
Dye-Migration Resistance ✔ Engineered In Limited None
Color Trueness Over Dark Shirts Excellent Good Poor
Flash Speed Fast Moderate–Fast Varies
Compatibility with Inktek LB Series ✔ Same System Depends on Brand Not Intended
Cure Temperature 280°F 320°F Varies

⚠ Pro Tip — Poly Blends

On 50/50 and high-poly garments, use a two-hit underbase technique: print, flash, re-register and print the blocker a second time. This doubles your migration barrier and produces noticeably cleaner results on poly-heavy shirts.

⚠ Storage & Shelf Life

Store Gray Super Blocker in a cool, dry location away from direct sunlight. Keep lids tightly sealed between runs. Properly stored plastisol has a 2-year shelf life from manufacture date — no refrigeration required.

Ready to Block Out Dark Shirts?

Add Inktek Gray Super Blocker to your cart and ship it today. Orders before 3:30 PM CT go out same day. Free shipping on orders over $200.

📞 (512) 454-0505  |  📧 [email protected]
Part of the Inktek LB Series

Pair Gray Super Blocker with any of 52+ Inktek LB Series plastisol colors for a complete, compatible dark-shirt printing system — all from River City Supply.

Technical Specifications

Inktek Gray Super Blocker — Technical Specifications
Product Name Inktek Gray Super Blocker
Ink Type Plastisol (PVC-based)
Primary Application Underbase / Blocker for dark garments
Recommended Cure Temperature 280°F (138°C) internal ink temp
Flash Temperature (Surface) 180–220°F surface temp
Recommended Mesh Count 86–160 mesh
Recommended Squeegee 70/90/70 triple durometer or 75–80A durometer
Dye-Migration Resistance High — formulated for polyester and poly blends
Opacity Maximum — full substrate block
Suitable Substrates 100% cotton, cotton/polyester blends, high-poly garments
Ink Series Compatibility Inktek LB Series; compatible with most standard plastisols
Available Sizes Quart (32 oz), Gallon (128 oz), 5-Gallon Pail
Shelf Life 2 years from manufacture date (sealed, room temp storage)
Storage Cool, dry location; away from heat and direct sunlight
Brand Inktek
Distributor River City Supply — screenprintsupplies.com

Technical Sheets / Safety Data Sheets / Documents

Printers Choice SE Safety Data Sheet

FREQUENTLY ASKED QUESTIONS

Why use gray instead of white as an underbase on dark shirts?

Gray absorbs less light than white, which allows your top colors to read truer to the original artwork. A white underbase can cause colors to appear brighter but sometimes shifts them toward “neon” — gray gives you more accurate, PMS-faithful results, especially for process-style multi-color prints on black garments.

Will Gray Super Blocker work on 100% polyester performance wear?

Yes. Gray Super Blocker is specifically formulated with dye-migration inhibitors to perform on polyester and high-poly blends. For best results on 100% poly, use a lower flash temperature to avoid heat-activating the dye before the ink sets. A two-hit underbase approach is also recommended on challenging poly garments.

Can I mix Gray Super Blocker with other Inktek LB Series inks?

Yes — Gray Super Blocker is fully compatible with the Inktek LB Series. However, mixing blocker ink with color inks will reduce its blocking performance. It’s best used as a standalone underbase layer rather than blended into your color inks.

What mesh should I use for printing Gray Super Blocker?

For a standard underbase application, 86–110 mesh works well — it deposits enough ink volume for full opacity without using excess product. If you’re printing a high-detail underbase (simulated process or photorealistic print), you can push to 130–160 mesh, though you may want to double-hit for complete coverage.

Does Gray Super Blocker require any additives or reducers?

No — Gray Super Blocker is ready to print straight from the container. Like all plastisols, it should not be thinned with solvents. If the ink is stiff from cold storage, bring it to room temperature and stir thoroughly. Avoid adding curable reducer unless specifically recommended by Inktek, as it may affect blocking performance.

How do I confirm the ink is fully cured?

Use a temperature probe (donut or thermocouple) to verify the internal ink temp reaches 280°F — surface temp alone isn’t reliable. You can also do a stretch test: a fully cured print stretches without cracking. For production runs, periodic wash tests (3–5 hot wash cycles) confirm long-term durability before shipping customer orders.

Does River City Supply ship same day?

Yes — orders placed before 3:30 PM CT Monday through Friday ship the same day. Free shipping applies automatically on orders over $200. Call us at (512) 454-0505 or email [email protected] with any questions about your order.
Still have questions about Gray Super Blocker?

Our team prints for a living — we know this ink and we know your setup. Reach out any time.

📞 (512) 454-0505  |  📧 [email protected]

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