After I found my perfect paint pen for rocks (which did not blur when sealed), I received a blog post comment which suggested "applying a layer of Elmer's Glue on the Sharpie Art, allowing to dry, before applying spray sealant."
I decided to try this out for myself but instead of using a spray sealer, I used two of my preferred brush-on sealers.
My first test used a Sharpie ultra fine point black permanent marker. I printed the words "Sharpie test" on my stone and followed it with a thin coat of white glue. After the glue dried, I applied a thin coat of Delta Ceramcoat brush-on sealer.
|White glue applied over a Sharpie marker before Delta Ceramcoat sealer|
For my second test, I used colored Sharpie permanent markers and drew a simple design on a pitted stone. Once again, a first coat of white glue was thinly brushed over the design. Then after the glue dried, I used Americana Duraclear brush-on sealer.
|White glue applied over Sharpie markers before Duraclear Satin Varnish|
I'm happy to report that white glue (e.g., Elmer's) used over Sharpie permanent marker pens did indeed prevent blurs when applied prior to both formulas of my clear sealers. (Note: I used this trick on small stones and cannot say how well it works with large painted rocks.)
Give this tip a try for yourself and let me know what you think.