CRT Aquadag

[boora2]

Got an old Thorn 4000 series TV with a 28'' RCA tube,for my 9yr old daughter to watch,picture fuzzy due to burned focus pot,replaced it ok,just the usual thing wrong,thick film unit in the video had been changed eons ago,but the coating on the tube is gone,used silver baking foil glued to glass,looks terrible,will be visitng the US soon,is there anything available to spray or paint on.