Does anyone have any experience with white paint pens? Decocolor or other brands? I really like the way they look on certain helmets and photos (like ny giants football helmets), but my little experience this far makes me hesitant to use them at a paid signing. THey seem not quite as reliable as the silver paint pens, but at one signing I had the multiple signers really take their time, and the item came out awesome.

Thanks in advance for any input!