Problem: On the first church sign I made, the vinyl letters went uphilll. Not good! Here's how I succeeded on the second try.
Start with a well-prepared board or other surface. The vinyl letters have been cut at the TechShop, weeded, and the transfer paper has been applied to the face of the letters. I'll call this sandwich the letter layer.
The other equipment you'll need: straight edge: cutter, masking tape, pen, burnisher.
Color was added by hand with artist's acrylic paint. Then the whole sign was sealed with several coats of clear finish.