I can't see why a tube of clear plumber's gold won't fix this?
http://www.toolstation.com/shop/p61...roduct=61679&gclid=CNCm9-Try9QCFYe37QodJpkDig
Andy
http://www.toolstation.com/shop/p61...roduct=61679&gclid=CNCm9-Try9QCFYe37QodJpkDig
Andy