http://www.planetlabel.com/labels/by_material/inkjet-laser/inkjet_weatherproof_white_gloss/white

Excellent topic - any tips on sellers offering to ship the sheets to Europe?

I have used several of Papilio's products, including the white waterproof vinyl. It was 3 mm thick and matte white. It gave me great results. The "permanent white vinyl" was 5 mm thick and a glossy finish, but also gave great results. The "white adhesive polyester" was also nice ( I must've liked it cuz I just noticed my box is empty ). Personally, I use both the inkjet and laser papers in a laser printer and have had no problems.

I would steer away from their rub-on decal paper. If you need ultra thin contouring decals, the water slide will give better results.

I have used a ton of different Papilio products, including the one you mention. If you want this for target decals, it will work with two caveats:

1) you will want to protect the face of the decals either using self adhesive Mylar or Papilio's clear overlay product. You do not want balls banging into the ink.

2) how are you planning to deal with the raised rivet spot in the middle? You can just try to ignore it and apply the decal to the uneven surface. I would personally apply a thin layer hard foam using an ultrathin 1 mm craft foam sheet like:
ebay.com link: 1mm CRAFT FOAM SHEETS 12 X18 12 pcs best in market
You can trim a hole in the center to accommodate the rivet, and then you can apply the target sticker on top of a perfectly level surface.

What's the best way to get the "rectangle with round corners" size we need for a drop target? Does any vendor custom pre-cut a size good for drops?
-mof

I have used most of their products and they are better than anything else I've come across. Much better than anything you'll find in your local hobby/crafts store.

+1 on covering the decal with mylar or Papilio's clear overlay product

Do you use a nice straight edge paper cutter at home to get the 4 edges, then do the corners by hand?
-mof

BTW, I discovered the hard way that you can't use Papilio's stuff in a Samsung laser printer (color or B&W). According to Papilio's tech support, their stuff can only go to 400' and Samsung runs their fusers much hotter than that. In my case the water slide decals wrapped themselves around my fuser and I had to take half the machine apart to fix it. They said it would apply to all their products, not just the decal sheet.

I don't blame Papilio --there are so many printers out there... (but it would have been nice if they had documented what was apparently a common known issue to them :O ). If in doubt, check your fuser's temperature is 400 or lower.

If you inkjet decals make sure you bond some kind of plastic to the decal or it will last a week.