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Welcome to the Bunnings Workshop community @Geoffbar. It's marvellous to have you join us, and many thanks for your question about Estapol.
Estapol is just a proprietary product name for varnish. You'll find plenty of types of varnish at your local Bunnings store that you could use as a replacement. One I can recommend and that I use often is Cabot's Cabothane. It's a hardwearing varnish suitable for various internal applications that comes in water and oil-based versions. Personally, I go for the water-based as it's extremely easy to clean up brushes and has next to no odour.
Please let me know if you have any questions.
Mitchell
