Well if you’ve caught it early enough and the cracking hasn’t gone too deep then it’s not too much of a problem. It could have been caused by you applying the paint too thick or maybe you applied it in cold weather or possibly if you’ve painted a gloss over a very flexible paint system that was currently on. The way to solve this would be to remove any loose or flaking paint with a scraper or wire brush, sand any edges, prime the area and then repaint it. If the cracks have gone deeper then you’ll need to remove all the paint – right down – either by scraper, sanding or even using a heat gun – then primer and paint. Try using Sandtex Trade Flexigloss X-tra for added peace of mind.