Siser has official instructions for their HTV materials.
Here is a direct link to a PDF of it on their site (will open in a new tab) - Siser HTV Instructions (PDF)
They also have an app available for you to download onto your iPhone or Android device.
NOTE: Siser EasyWeed Stretch requires FIRM even sufficient pressure. We do not recommend EasyWeed Stretch to anyone unless they have already used regular EasyWeed Heat Transfer Vinyl before and have access to a heat press and a pressing pillow. If you chose to apply with a home iron or without using a pressing pillow there is a greater chance of your product lifting during wear or wash and we can not be responsible for those situations. Both heat presses and press pillow are available for purchase on our website.
EasyWeed Stretch is a very thin, very flexible film, and with this said it is very particular about its pressing settings, including temp, time and most importantly pressure. With this said, there have been some people having difficulty over the past couple of months with EasyWeed Stretch not staying adhered as well as it has in the past. We have talked to Siser about this a few times and also done some testing on our own and have come up with a solution that should help. We are now recommending EasyWeed Stretch to be applied at 320 degrees for 20 seconds (instead of 305 for 15 seconds). This bit of additional temp and time seems to make the difference in getting a quality result from the product and should lessen your issues with it.
As always if you have trouble working with any product please do not hesitate to reach out to us (email works best) or Siser themselves. We are an authorized distributor and because of that when you purchase from TVS you gain both the support of TVS and of Siser NA.