Insert the foam stickers into the bottle. If the neck of the bottle is narrow, use a utility knife to carefully feed the sticker into the jar. Once your sticker is in the jar, use a pencil or any other long, narrow object to press the sticker against the side of the jar. [2] X Research source Wrap your bottle in a plastic bag. Tape the bag to the neck of the jar to keep it in place. Set the wrapped bottle in a tarped area or in a box. Put on some gloves, while you’re at it. These measures will help you avoid getting paint anywhere you don’t want it. Insert the spray paint nozzle into the jar. Spray a layer of paint into the jar or bottle. Wait a few minutes and spray another layer. Rotate the glass bottle so that the paint covers the entire inside. [3] X Research source After the bottles are completely dry, remove the foam stickers from the inside of the bottles with a utility knife. If you notice that a little paint dripped into one of your covered areas, you might be able to scrape this off with your utility knife. This can happen if the sticker did not fully adhere. [4] X Research source

This could cause dripping and uneven areas on your finished bottles. Add a second coat if needed.

A craft box full of scraps and leftovers is a great place to look for finishing touches and extra decorations for the outside of the bottle. [5] X Research source

Always read the labels thoroughly before selecting a paint. If it doesn’t indicate that it’s intended for glass, it will likely chip off soon after your design dries.

If the glass is not perfectly clean, it can make the paint job uneven or spotty.

Practicing your design ahead of time is especially helpful if you only have a vague idea or concept at the outset. [8] X Research source

If you have a very steady hand, you can use a permanent marker. [9] X Research source

Use caution with paint thinner. Too much may result in dripping paint that will not set properly. [10] X Research source

Fill the syringe with the desired color and insert it into the bottle. Inject the paint into the bottle. Rotate the bottle in order to cover it on all sides. [14] X Research source

Cover the bottle in strips of tape and leave gaps in between each strip; then, paint the entire bottle. After the paint has completely dried, carefully extract the tape. [16] X Research source