In my experience, the type of card matters a lot. Older cards sign well. The worst are modern Japanese non-holos which will literally repel ink from certain markers. If you can sign a modern new back non-holo, you have a pretty good marker. In comparison, textured cards tend to be easier to sign but they have another problem of having the ink seep between the ridges if it’s too liquidy.
I’ve tried powder once, didn’t like it. I’ve had some good success with Mr. Clean Magic erasers. I think the idea is you want to create a rough micro-surface on the card and the Magic erasers are like extremely high grit sandpaper. For all this stuff I’m saying, I recommend trying it out yourself because there are so many different variables between cards
These oil based sharpies are good, I believe Alec bought them at some auto events. They leave a really nice thick and vibrant signature. In my tests, not all oil based markers are equal so experiment first.
I tried these water based ones that were complete trash. They literally become vanishing ink on a new back non-holo which is crazy to witness. Maybe I can show a video some time.
These ones were probably some of the best I tested in terms of sticking to things. They show up really bold too. Would recommend trying them !
