Mara^® Poly P.

The ink should be stirred homogeneously before printing and if necessary during production. Prior to printing, it is necessary to add hardener to the undiluted ink in the proper mixing ratio:

All basic shades except Overprint Varnish:
800 g Mara^®Poly P +
100 g (= 12,5 %) H 1

Overprint Varnishes P 910/911/913:
500 g Mara^®Poly P +
100 g (=20 %) H 1

If basic shades are mixed with Overprint Varnish P 910 the proper addition of hardener must be calculated in the correct ratio.

When using hardener, the processing and curing temperature must not be lower than 15 °C as irreversible damage can occur. Please also avoid high humidity for several hours after printing as the hardener is sensitive to humidity.

Pre-reaction time
It is recommended to allow the ink/ hardener mixture to pre-react for 15 min.

Pot life
The mixture ink/hardener is chemically reactive and must be processed within 8-12 h (if stored at 20 °C). Higher processing temperatures reduce the pot life. If the mentioned times are exceeded, the ink's adhesion and resistance may be reduced, even if the ink still seems processable.
By continuously adding freshly mixed ink plus hardener, the pot life can be extended up to 24 hours if working in 3 shifts with rather low ink throughput. 

Parallel to physical drying, i. e. evaporation of solvents used, the actual hardening of the ink film is caused by the chemical cross-linking reaction between ink and hardener.
The following standard values can be assumed concerning the progressive cross-linking reaction (Mesh 90-55, single print):

Dryness degree	Temperature	Time
overprintable	20 °C air drying	20 min
overprintable	hot air drying	4 min
scratch resist.	20 °C	3 h
cured	20 °C air drying	8 days
cured	80 °C oven drying	60 min

The mentioned drying times are only guidelines as they depend on the printed ink film thickness, air humidity, drying conditions, and the selection of auxiliaries such as thinner and/or retarder.

If multicolour prints are dried with enforced heat between printing sequences (by hot air or infrared), the time for overprinting is reduced to approx. 3-4 min.
Due to extreme stress on crates and ink, we do not recommend flaming.

When drying with enforced heat of more than 150 °C, the heat influence must not exceed 5 min in order to avoid yellowing, especially with White 970. Generally an extended drying time is necessary when overprinting the ink.

The ink film underneath must not be completely cured when overprinted. If the ink film is dried at room temperature 20 °C, overprinting must be carried out within 8 h. We recommend overprinting as soon as possible, in order to guarantee a good adhesion between the ink layers.

All types of commercially available polyester and nylon fabrics and solvent-resistant stencils can be used. For a good opacity on dyed substrates, we recommend a fabric thickness between 68-64 and 90-48, for printing finest details 100-40 to 120-34.