What do I do if some of the iron-on doesn’t stick after I put heat on it?

Be sure to use the recommended settings specific to the heat-transfer and base materials you're using. These settings are found in our online Heat Guide or Cricut Heat app (for Cricut EasyPress 3).
Ensure you're using a firm, even surface. Ironing boards and plastic surfaces have some give in them that don't provide the firm, even surface needed for successful results.
Re-touch the material with heat for an additional 10-15 seconds.