My friend in Louisville, Kentucky uses Duracoat, along with a few other products. He stated that he does not like their templates: too much work.
If you can live without a template, you can do what I do. I have used the following technique with Brownell's Aluma-Hyde II, KG coatings, Duracoat, and regular spray paint (NOT on my ARs though!).
I like striping, like tiger stripe or 'urban' stripe. I pick a base color, the lightest color you plan on using. I cover the entire piece: let it dry, cure, whatever it does. I then take masking tape for PAINTING, because painting masking tape (7 or 14 day tape) removes easily, and does not leave residue. I tear the tape in stripes; this gives a ragged edge look. I put the tape where I want; then, apply my next lightest coat color. If I am doing three or more colors, I leave each layer of tape in place. Once done, I remove tape, finely WET sand with 400 grit, or finer, using WET sandpaper: 3-M makes excellent wet/dry paper and is sold at my local NAPA and Auto Zone parts stores. By finely sanding, edges between the coats are leveled, and finely sanding, when done right, will not go through to the piece. I ONLY sand where I feel edges, with which I cannot live. You can also apply a clear topcoat if you want. I never applied a topcoat.
Though this doesn’t answer your question, I hope that this helps for a future project.