History:
Myself i am a time srved plasterer with nvq 3 and city nd guilds with over 30 years experience. My business partner is a time served tile. Setter with over 30 years experience in wall and floor tiling.a d together we have completed numerous plastering jobs and numerous tiling jobs alsoo kitchchen snd bathroom installations along with lots of other various plastering and tiling work
Answers:
Yes but easier to spread layer of pva to underneath of each tile apply with either a sponge or paint brush
No your better off using either a bathroom or kitchen paint which is breathable otherwise the paint could dry and crack
Yes there is always adapters available to make adjustments
First you need to check if plaster and render has blown..in stall a dehumidifier to remove a lot of the built up moisture from wall.i would then suggest to clean arwa with bleach and water..if all is then fine and there is no need to replace plaster and render.then add a miss coat of diluted paint then apply.a.srain block such as zinnser b-i-n multi surface stain block and surface primer..but there are many different brands available. but black mould normally is a sign of poor ventilation.
Normally you would have an iso value to radiator turn that off along with the radiator tap