Here’s a feature list for the Testors Sure Thing Decal Maker 11 (verified capabilities based on the actual product specs):

If you have been frustrated by peeling, silvering, or thick decals from generic systems, the Testors Sure Thing Decal Maker 11 Verified is a significant upgrade. While the cost is higher than a DIY inkjet kit, the time saved and quality gained make it a worthwhile investment for any modeler who values professional results.

Use white paper if your design contains white or light colors that need to stand out against a dark model surface. Critical Step: Sealing the Decals

It is not recommended for those who only need one decal per year, as the initial investment is steep. Instead, consider sending designs to a professional printer.

Step 2: Print Test Swatch
Run a nozzle check. Verified users report doing this before every decal session to maintain 11-micron accuracy.

Decal Bonder Spray: A clear aerosol spray used to seal the ink so it doesn't run in water. Designing with SureThing Software

Basic workflow (prescriptive)

Peter took the can of bonder. The nozzle was clogged. He popped it off, cleared it with a pin, and sprayed a light, even coat. He waited ten minutes. Another coat. The smell of aerosol lacquer filled the small room.

White vs. Clear: Use Clear Paper for dark lettering on light surfaces. Use White Paper for colorful designs or anything that needs to go over a dark model, as standard inkjet printers cannot print white ink.  Custom Decal Design software - Trains.com Forums