The best time to put a gloss coat on the painting is when the painting has dried for atleast one or 2 weeks and the colours have set deep into the canvas. The gloss coat will run smoothly over the paint and make the colours look brighter once the gloss is dried. The gloss also works like a weather proofing agent preserving the colour pigments. It also takes the painting to the next level giving it a finished look.
Abstract art is a form of expression, it gives the artist the freedom of colours, shapes and forms. Every abstract needs to convey a story or concept to become more attractive. Abstracts are fun as there is no right or wrong in this game of colours. Play with it and enjoy every pixel of colours.