Ranger makes this wonderful product called Glossy Accents. It is clear and it is not only a dimensional adhesive but it can also be used as a dimensional glaze to give your projects a great shine. It really is all you need to hold the heaviest embellishment to your project.
This is a collage card I made using Glossy Accents to give everything on the card a great glossy coverage.
The card has an angled front panel and I used some cool Australian stamps to feature in the collage. The card was a project in Get Creative magazine in Australia. You can find detailed instructions for making it here.