I hope this is the last sympathy card I need to make. This is for my daughter in law. I used gold embossing powder over vellum. Then attached it to a light blue card base. My heat gun was really hot but the vellum still warped and it just wouldn't glue down in some places. What do you use to attach vellum to cardstock? I used my connect glue since it dries clear and held it down forever but it still buckled. Thanks for any help on this.