Can resin act as a varnish/glaze?
Only if it is continuously supplied with both fuel and oxygen. Many fire extinguishers operate on the principle of smothering the fire - denying it access to oxygen. Fire blankets also work on this principle. For larger fires, removing the oxygen is generally impractical, so we make the fuel much harder to burn by pouring water on it. Ultimately this leads to the fire running out of energy to keep going. In fire-prone areas it is also usual to limit the amount of fuel available, by constructing firebreaks (strips of cleared land, so that when a fire gets there it has no more fuel and cannot go any further), by doing controlled burns to keep undergrowth down, and by back-burning (burning out a section of land that a specific fire is heading to, so that when it gets there it will run out of fuel).
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Sounds like a ancient work of fiction. Water and fire (in their natural states) do not mix. No way, no how. Sorry:(