[leighatkins]

Hi 'King'
You have some good points there.
Parrafin wax is a largely inert substance that your grandma used to seal off her preserves into her jamjars to stop them oxidizing or becoming mouldy in storage. It is used in cheap fast-burning candles and in my experience, remains white/clear for seemingly ever.
It will act as a sealant and therefore may need 2 to 3 coats on timber fences or bare brick walls etc. as it will soak in and may be uneconomical or undesireable for such uses, but most surfaces would be non-porous ie. colourbond fencing etc.
Full exposure to the hot sun all day may melt the coating slightly and in theory may even liquify the coating whilst it is hot which would prompt one to ask if there are any compounds out there which can increase the level of melting point (effictively setting it) so that only intentional removal can be carried out.