1. Open the polish bottle, then remove any remaining polish from the brush.
2. Grab the brush and cap firmly with one hand while using the other to hold a paper towel, and then pull until the brush and cap are separated.
3. Then, put the replacement glue brush inside the bottle, top it off with the appropriate cap, and tighten it all the way. The brush and cap will be attached as you secure the cap onto the bottle.