SK DTG Pretreatment
Made in Thailand by S.K. Color & Chemicals. 5 formulas cover cotton and cotton-poly blends, light shirts (colour ink) and dark shirts (white ink), plus OverLock post-treatment for better wash fastness.
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100% cotton
White / light shirts (colour ink, no white underbase): PRT-DTG-WC
Black / dark shirts (white ink underbase): PRT-DTG-DC or PRT-DTG-UDC (premium)
Cotton-poly blend (TC)
White / light shirts (colour ink, no white underbase): PRT-DTG-TCWC
Black / dark shirts (white ink underbase): PRT-DTG-TCDC
For even better wash fastness, use OverLock POT-DTG-OVL01 after printing, on shirts of any colour
The full SK Pretreatment range
PRT-DTG-WC
No white ink underbase needed, very little visible stain. Concentrate, mix 1:3 with water.
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PRT-DTG-TCWC
For light TC fabric, no white ink underbase needed. Concentrate, mix 1:3 with water.
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PRT-DTG-DC (standard)
Helps white ink hold onto the fabric, little stain when sprayed at the right amount. Concentrate, mix 1:3 with water. Certified OEKO-TEX® ECO PASSPORT and ZDHC MRSL Level 1.
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PRT-DTG-UDC (premium)
Ultimate formula with a built-in crosslinker that helps prints stand up to more washing. Concentrate, mix 1:3 with water.
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PRT-DTG-TCDC
Helps white ink hold onto dark TC fabric and reduces ink bleeding or spreading. Concentrate, mix 1:3 with water.
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OverLock POT-DTG-OVL01
Post-treatment used after printing to help prints resist washing and rubbing. Concentrate, mix 1:1 with water.
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How to use, in short
WC, TCWC, DC, UDC, TCDC: mix 1 part pretreatment with 3 parts water. Distilled or RO water is best.
Spray evenly all over a clean, dry shirt. Dark fabric (DC, UDC): about 20–30 g per 38 × 46 cm area. Light fabric: a thin coat, do not soak it.
Dry completely before printing: heat press at 165–180°C for 40–60 seconds, or tunnel dryer at 145–160°C for 100–140 seconds.
Print DTG, then cure the ink. These are starting values; test with your own shirts, ink and printer before production.
Works with water-based DTG printers such as Brother GTX / GTX Pro / GTX Pro Bulk, Epson SC-F2100 / SC-F3070, Ricoh Ri1000 / Ri2000
Real print samples
Chemical safety standards (PRT-DTG-DC only)
Certificate number 25.0.13259 (Hohenstein), valid until 31 December 2026. Check it at oeko-tex.com
SGS certificate number 112408520057 for SK Dark Cotton Pretreatment, tested to ZDHC MRSL V3.1, valid 5 Dec 2024 to 4 Dec 2026
Both certificates cover PRT-DTG-DC only. The other formulas are not certified.
Frequently asked questions
Which formula for black shirts?
Dark cotton: PRT-DTG-DC (standard) or PRT-DTG-UDC (premium). Dark cotton-poly blend: PRT-DTG-TCDC.
Do white shirts need pretreatment?
If you print colour ink on light shirts, use PRT-DTG-WC (cotton) or PRT-DTG-TCWC (cotton-poly blend). No white ink underbase needed.
How long does it keep?
36 months from the production date, and 12 months after opening.
Do I need a code to buy four 5 litre gallons?
No. The discount is applied automatically when there are 4 or more 5 litre gallons of the same formula in the cart.
Can I get the SDS / TDS?
Yes. Contact the SK team on our contact page