Hi! So I had the same issue with metallic envelopes and paper... I used Lustre and Silver Ore from cardsandpockets.com. After a lot of research (the ladies on the DIY board rocked with advice) here's what worked for me:
* If you have a laserjet printer:
- Go under "printer properties" and change the paper type to "transparency" or "vellum". These settings release the least amount of ink, and will reduce smudging.
- The laserjet should heat seal the ink, and the envelopes should print without a problem. I printed 5 at a time and let them sit for a few minutes to dry to be sure.
* If you have an inkjet printer:
- Change the paper type as above.
- This is where it gets tricky. Print them, and grab them as they come out of the printer so they don't sit against each other. The ink will be damp.
- Let them sit out overnight to dry. The ink may still be wet in the morning.
- Get some all-purpose clear craft acrylic spray ($4.99 at Michaels) and lightly spritz the envelopes. The spray will dry clear and seal the ink.
I also tried microwaving the envelopes (another suggestion online) but the ink still smudged. It's a process, but it works! Good luck!