We make ink for screen printers who want reliable, long-lasting prints. Getting the cure right is the most important part of the printing process. A properly cured print stays intact and durable through repeated washing. An under-cured print may look fine at first, but it can crack, peel, or wash away.

Whether you print in a garage or run a production shop, understanding how plastisol cures will help you get more consistent results and fewer failed prints.

Why Proper Curing Matters

Plastisol ink does not air dry like paint. It cures when it reaches a certain temperature. Once it reaches a certain temperature it changes from liquid to solid.

If the print never reaches its cure temperature all the way through, the surface may appear dry while the bottom of the ink film remains soft. This is the most common cause of failed prints.

Proper curing helps:

What Temperature Does Plastisol Ink Cure At?

Most standard plastisol inks cure around 320°F. We recommend our Smart Series and .357 Series for standard cure shops.

Low-cure inks often cure between 260°F and 280°F. We recommend something from our ELT Line or Hybrid Pro Series for low-cure shops.

Always follow the recommendations for the specific ink you are using. Cure temperatures vary between products.

The important thing to remember is that the entire ink deposit must reach the cure temperature, not just the surface. Thick ink deposits require more time than thin prints.

How To Cure Plastisol Ink With A Conveyor Dryer

Conveyor dryers are the preferred method to properly cure screen printing ink because they provide steady and repeatable heat.

Allow the dryer to warm up completely before production. The first few shirts from a cold dryer may not receive enough heat.

Run test shirts and adjust the temperature and belt speed until the ink reaches the cure temperature.

Thicker prints and heavier garments may require slower belt speeds.

Drafts and room conditions can affect curing consistency, so keep airflow around the dryer under control.

How To Measure Cure Temperature

Guessing is one of the biggest causes of curing problems.

Several tools can help:

How To Tell If Plastisol Ink Is Fully Cured

The most reliable method is a wash test.

Print a sample shirt using the same settings as your production run. Allow it to cool completely. Turn it inside out and wash it normally with detergent. Dry it as usual.

Inspect the print for:

Stretch tests can help identify severe under-curing, but passing a stretch test does not guarantee a proper cure. Wash testing provides a much more reliable answer.

Common Plastisol Curing Problems

Cracking After Washing

Cracking usually means the ink did not fully cure. Increase dwell time slightly or verify temperatures with additional testing.

Sticky Or Tacky Prints

Sticky prints are another sign of under-curing. The ink needs more heat or more time.

Discoloration

Excessive heat can cause discoloration or make the print brittle. Reduce temperature or dwell time.

Dye Migration

Polyester garments can release dye into the ink when overheated. This often appears as a pink or ghost image on the garment.

Products such as ELT-S Series are designed to help minimize dye migration on polyester garments.

Uneven Results Across A Print

Large designs with heavy ink deposits sometimes cure unevenly. Areas near the center may need more time than thin edges.

Always focus on curing the entire ink film, not just achieving a surface temperature.

Tips For Better Curing Results

Use the right ink for the garment you are printing. Standard plastisol products such as #26 HV White, and Underbase White work well on cotton garments. Polyester often requires an ink from our low-cure line of inks.

Print thinner layers whenever possible. Multiple thin deposits with flashing in between each layer cures more evenly than one heavy layer.

Keep records of successful settings, including:

Good records make future jobs easier to repeat.

Train everyone in your shop to follow the same curing procedures. Consistency matters more than expensive equipment.

Final Thoughts

Curing plastisol ink is not complicated, but it does require consistency. Most curing problems come from guessing instead of measuring.

We recommend testing every new combination of ink, garment, and equipment before running production. A few minutes spent checking temperatures and performing wash tests can prevent expensive mistakes later.

If you have questions about curing temperatures, garment compatibility, or choosing the right ink system, we're here to help.