Over the years, I have used many different adhesives...I have to say at the moment my favorite would be this gel adhesive by Martha Stewart. I found that if I gently squeeze the bottle, a fine mist comes out, which works perfectly when working with small items such as letters. My experience with glue writing pens, usually turn into a nightmare. The letters want to stick to my hands or the glue pen. I even tried the gel on ribbon and that works great also! My latest project included applying small detailed letters to glitter paper.