Rose Floral Printed Glitter Pattern Heat Transfer Vinyl Sheets By Craftables

I am a small home based t shirt making business and I have made 100s of shirts, used several mediums of htv from puff to metallic, glitter to spectrum. NEVER have I tried to use a product that came with no instructions on how to use or have I ever dealt with customer service, if that's what you call it, that gave absolutely no answers that were useful.
I make shirts that are layered, sometimes a lot of layers, shirts with multiple medium of types of vinyl. How on earth if you use 2 types of vinyl and have each type welded are you supposed to transfer and get your designs lined up properly if your vinyl won't even stick to a transfer sheet? I will never recommend this company and I will never use any of your product again. Absolutely the biggest waste of my time and money.