Greece and Cyprus have an interesting not-quite-joined-up history - the assumption over here is that Cyprus is completely Greek, but there was an administrative error with the paperwork.
I have never been to Cyprus, so I don't know how Greek it is in terms of products available and who sells what, and where. However, if by "meths" you mean methylated spirits, you should be able to buy that in a chemist. They do cheap "alcohol", which is blue meths, and an expensive clear, 99% version, which is probably ethyl alcohol as opposed to methyl alcohol (and won't make you go blind if you drink it). At least, that is in my local pharmakio, anyway. It also has one of the more unpronounceable names: oinopnevma. As in oinos (pronounced eenoss=wine) and pnevma =spirit. They also do a mineral oil (white oil - lefko ladthi), which can be used as a finish, or drink it to clear out your pipes, if you prefer
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I have no option but to speak Greek - we live in the Greek equivalent of Bodmin moor, and no one here speaks English. Getting intelligible Greek is tricky enough. 20 years on, and it's still a bloody silly language. I lived in Spain for 3 months, and by the end of it I was able to converse reasonably well, if only in a basic way, but Greek? How many 8 syllable words do you need? I sometimes get the feeling they are doing it on purpose - being willfully difficult, just because they can. There are two different ways to pronounce the number seven, and I once asked someone why they used both variants in the same sentence. The answer? "Because I can".
God bless their little cotton socks.
Final thought - there is a YouTube chappie from Zakinthos who does a lot of turning - some of his videos are in English, or have English subtitles - he is very keen to tell you what he uses, which might help regarding finishes:
https://m.youtube.com/watch?v=sGGx5cL5NGA