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Remove any tape, clothespins, or rubber bands first. Sand excess glue off with a file or a craft blade. Fill in any remaining gaps with modeling or epoxy putty. Use a mini metal spatula to smooth the putty down. Wait until the putty cures before moving on. If the putty still is not smooth, you can sand it down with a file. If you painted your model previously, you will need to paint over the putty so that it blends in. Take out the instructions that came with your kit. Read through the instructions once more, then glue the individual parts together to build the model. Remember to apply the glue or cement to both parts before pressing them together. You may have to do this in several stages by completing smaller parts first, then assembling them into larger parts. How long this takes depends on the product that you are using, so read the instructions label carefully. Most model glues and cements will have 2 drying times: a handling time and a curing time. In this case, you should refer to the curing time. If you handle your model before the glue or cement is done curing, the model may fall apart. If you didn't paint your model earlier, now is the time to do so. If you already painted your model, inspect it carefully and note any areas with chipped or scratched paint. Fill these areas in using a small brush and matching paint. Allow the paint to dry completely before moving on. How you do this depends on the brand that you are using, so read the instructions carefully. In most cases, you'll need to dip the decal in water, then set it aside for 20 seconds. After that, you'll slide the decal off with tweezers, and place it onto the model. Trim the decals down with scissors before you begin. This will make them easier to work with and reduce seams and borders.
Fill in the gaps or sand off the excess glue. Assemble the parts to complete your model. Wait for the glue to dry and cure. Paint the model, if needed, or make any touch-ups. Apply any decals, if needed.