This only works with Laser Printers not inkjet
You may get different results .Two items can greatly effect this process.
PRACTICE PRACTICE PRACTICE
Print Decal Page on laser printer. This process works best with lighter paper stock. Here is a resource for decal pages
Place clear packing tape over the area of the decal you want
Cut around decal
Place decal into warm water for about 2 minutes
Turn over decal to the paper side and scratch off the paper – don’t scratch the ink to hard
Allow to dry – you may see some residual paper after it dries. If so, repeat the water soak and scratch.
Apply a clear drying glue to the back of the decal. I recommend Aileene’s tacky glue.
Hold the decal into place on the rocket for a minute or so to get a good seal.