Hi chesterfield, Glass panes are usually bedded in linseed oil putty. Unless regular painting with oil based paint occurs the putty dries out and as in your case mould grows in the putty. You will need to scrape out the worst bits, treat with a fungicide, refill with lop and once this has set paint. Regards S
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!