Hi Cindy,
If you don't get a response in this section, try re-posting your question in the heat press section. I don't work with the material or product, but the folks who heat press scan the heat press sections regularly. It's possible you'll get more exposure to someone who may have done this over in that section.
Also, maybe give you post a little clearer title, like "Can I heat press Dacron with eco-film?" Anyone who has done this will have a better chance of finding your question that way.
Have you contacted the manufacturers to see if they know?
Good luck to you, I hope these suggestions help you link up with someone who can give you an answer.
Best regards,
Kelly
Dacron tablecloths and chair covers 
