Painstakingly researched, artist review of Paint pens.
We just have to accept this hard truth: There is no such thing as a "perfect" paint pen. They can clogged up, they can leak, sometimes they don't last long and sometimes they seem to last forever. That being said :) here's a 2-cent opinion from someone who has tried them all.
--Sharpie brand pens are my top choice.
--Sharpie water-based pens seem to have fewer problems than Sharpie oil-based pens.
--Sharpie Poster-Paint pens, especially in extra-fine tip, are my top choice, but if you need oil-based pens, these are your best choice.
On a side note: Who knew purchasing paint pens could be so challenging? It's nearly impossible to get all the listings in one search due to OnlineShopDealer's search engine. No matter how general or specific you search, different choices will show up and disappear. I suggest simply searching for paint pens, then filtering brand to BOTH Sharpie and Sanford for the best results.
One great, one poor
Be sure to read the directions carefully BEFORE using these. I'm not sure now if one of them is defective or if it was my incorrect prep. Unlike MOST paint markers, you must compress the tip while pointing UP, then shake, then compress the tip while down -- instead of just shaking, pointing DOWN and compressing the tip. Whether that was what did it or not, my silver marker just pools, blobs, and never saturates the tip BUT my gold is fine (or extra fine, in fact).