Do not try to spray in damp, cold or windy conditions. When spraying on the top coats keep the aerosol can moving horizontally, and do not stop or start when you are over the areas being painted. Allow sprayed lines of paint to just overlap, but do not try to make the first top coat cover fully. Have patience - allow the paint 10-15 minutes to partly dry between coats. Six or seven coats may be needed to achieve a good blend of colour. Leave the paint to harden before blending new and old paint at the edges.