The glass painting kit has 10 assorted sets of vibrant colours that are ready to use and do not require any medium. The glass paint can be used on multiple surfaces like glass, wood, terracotta, and OHP sheets to create unique DIY projects. While using on terra cotta a base coat of white colour needs to be applied first, for the colours to stand out. While using the glass painting colours make sure that the surface is flat. The fevicryl glass painting kit is nontoxic and waterbased. Since it is nontoxic it can be safely used by children as well. It can be directly used on glass, wood and OHP sheets without any medium.