You Have Just Been Poisoned

Moisten a paper towel with rubbing alcohol and wipe the bottom of the glass squeaky clean.

You may find backlighting makes it easier to position the stencil accurately. I put a small flashlight inside the glass, as shown, to shine up through the bottom.

Peel off the stencil's opaque backing sheet and set it aside, but do not discard it. It will be used in step 3.

Carefully align the stencil over the bottom of the glass, centering the text as best you can.

Once you have it lined up correctly, press the center point of the stencil into place on the glass. Then smooth the rest down by working from the center out to the edges.

You may get some small bubbles under the stencil. These are only a problem if they interfere with the stencil art. "Trapped" bubbles may be annoying, but will make little difference in the long run.

Carefully peel off the stencil's clear carrier sheet. Go slowly where the stencil has lots of detail. Small "islands" may be prone to lifting, at this stage. Use a toothpick if necessary to hold them down and/or reposition them as you remove the carrier.

Once the carrier is removed, take the backing sheet you set aside in step 2 and lay it waxy-side down over the stencil. Rub the rounded point of a marker or other similar tool over the backing sheet, applying pressure through it to "burnish" the stencil and make sure all parts of it are well-affixed to the glass.

Use the point of a sharp hobby knife blade to pierce and lift the "positive" areas of the stencil free of the glass.

The clear carrier sheet makes a handy place to deposit the scraps.

You may want to repeat the burnishing operation from step 3 before proceeding.

Etching cream contains salts that slowly dissociate to give hydrofluoric acid (HF), which is what actually etches the glass. Wear gloves and goggles and follow all directions on the bottle closely.

Whatever applicator you use should only be made of plastic and/or wood. Metal, glass, or ceramic parts will react with the etching cream.

Daub the etching cream generously onto the stencil with the applicator, being careful to thoroughly cover all positive areas and also to avoid getting etchant on the exposed sides of the glass.

Allow the etching cream to sit undisturbed for five minutes (or whatever it says on the bottle directions).

Thoroughly rinse the etching cream off the glass under a strong stream of warm water. Use a sponge to make sure all parts of the stencil are cleaned.

Once all visible etchant has been removed, thoroughly rinse the sides of the glass. Move carefully around the entire diameter of the glass, rinsing down the side, to make sure that all traces of the etchant have been washed away.

Without inverting the glass, wipe it dry with a paper towel then set it aside, on another paper towel, to completely air dry.

When the glass is completely dry, hold it up to the light and inspect the etch closely to verify that you haven't missed any spots.

If there are flaws in the etching, simply reapply etching cream and rinse as in steps 5 and 6.

Repeat until the etch is complete to your satisfaction. Mine did not need any retouching.