I do not know your skill level but there are 4 things that cause prints to fail and any one of them or a combonation of several can and will cause failures.
1. The vinyl need a clean non porous surface, free from wax and all contaminents.
2. If the prints are not cured properly, the solvent will breaks down the adhesive. You will know by: the smell, when you peel the liner the edges will curl, adhesive is overly agressive, and the prints stretch easily.
3. Too much stretching. When you stretch the vinyl the memory will want to pull it back to it's original shape. The adhesive also gets stretched. Less adhesive has less holding power.
4. It takes at least 24 hours for the adhesive to wet out and build maximum bond. During that 24 hours, and before it has reached maximum bond the vinyl is shrinking an pulling away from the problem areas. You must post heat all indentations, edges and problem areas even if you didn't stretch the vinyl. The proper tempurature is aprox 220 deg depending on the manufacture. Some manufactures claim that this erases some of the memory in the vinyl, but all agree that this makes the vinyl wet out and build maximum bond immediately.
5. With 3m Primer 94 is suggested for problem areas. It is an adhesive promoter and best used with thin/light applications. It has no strength or holding power it's own. If you glop it on it will not work properly.
