Summarize:

Removing the tape before it cures will give the paint lines a nice, crisp finish. Try not to touch the paint, with your gloves or otherwise, to avoid smudging. After you've reached the color you want, acrylic sealant can secure the coats and give your cart a glossy finish. Sealant can be applied like spray paint, so choose a spray can if you've never used paint sealants before. After applying the coat, wait thirty minutes before proceeding to finish the cart. One coat is necessary, but two coats can create an optional protective layer. Wait thirty minutes in-between applying coats. Either after or while your sealant is drying, remove the drop cloths from the ground and store them as desired. Place any remaining spray cans in a room temperature drawer for future use. Dispose of or recycle any newspapers, rubber gloves, or sandpaper squares. Although the sealant may seem dry after two hours, the cart will need time to cure after painting to fully set. Leave your cart outside or in your garage with the windows and doors open and leave it alone for a full day. Do not touch your cart during this period to avoid fingerprint smudges.  Reattach any parts you removed before painting after the cart has dried. Check the weather report for the next day to make sure your cart will not receive wind or rain exposure. If the weather looks stormy, paint your cart in the garage with the doors open.
Remove the masking tape ten minutes after spraying. Add a coat of clear acrylic sealant. Clean up the area. Let your cart dry for at least twenty-four hours.