hi , l have a 20cm hairline crack in my Acrylic shower base , l think it would caused by slight movement or flexing of the base under my weight over the years. Most people l spoke to online said in such a case the crack itself cannot be repaired and the entire base needs to be removed replaced with a new one but one builder said it could perhaps be repaired with epoxy , perhaps he means fibreglass epoxy. What is correct does the shower base need to be removed and replaced or can the crack itself be repaired ?