Pro tip time...
You can get really anal about vinyl placement... measure, mark... measure again, scribble out the old marks and pencil in new.... trying to be exact can be maddening. Hint; you don't need to be exact, jus' close enough so no one notices...
I find a reference point, in this case the white line across the bottom... and use painters tape to "stack" lines until it becomes it's own reference point "about" where you want the vinyl. Run another side to side across the top and Bob's your uncle.
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'Nother tip... after you squeegee the vinyl on and peel the top off, use a pencil point flashlight and shine across it at as shallow an angle as possible. Any air bubbles that need removing will stand out like a sore thumb by the shadow they cast. Here you can clearly see the grain of the vinyl. Yes, it's shiny, but even shiny will have a grain. If the grain cast's a shadow, a bubble will look like a mountain. Got lucky on these, so unfortunately no bubbles to shoot a pic of.
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Last tip... a personal preference actually. Use a soft squeegee. Most vinyl kits come with a hard squeegee. They work good when you first apply the decal. After you peel the paper off however, they can scratch the vinyl.... and pretty badly in some cases. A brand new bondo applicator does an excellent job of chasing out bubbles without scratching.
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