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is the yacht varnish fireproof?

i'm just restoring a slate fireplace which has a lovely pattern on it but i'm guessing it's been varnished in the past but it's been stored in a garage and the varnish has gone milky making it look pale. when i've collected it from the seller he had it out in the rain,
1, it made the fireplace look a lot darker and greatly improved it's looks.
2, it also made the varnish soft so it came off with with a
good rub down with a cloth and hose pipe,

the result though has left the paintwork dull and pale but it looks a lot better when wet so i'm guessing using varnish would restore it's looks but it will be around a working logburner so obviously it needs to withstand the heat.
any advice would be appreciated.
matt, September 2019
Why not look at some restoration forums and ask what is best to refinish a slate fireplace. I dont think it'll be yacht varnish, not because of fireproof issues but I think its not the right stuff.

On the pamment stones in my inglenook we used boiled linseed oil (several coats) then a few coats of beeswax.

https://homeguides.sfgate.com/restore-slate-fire-surround-43067.html

https://www.amazon.co.uk/Stovax-4109-slate-dressing/dp/B007OA56K8

http://www.fireplacemall.com/blog/2015/10/how-to-clean-slate-fireplace/

Pnbgfddf, September 2019