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High temp varnish

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duncan webster17/02/2022 11:44:14
5307 forum posts
83 photos

During the depths of lock down I retrieved a stalled project, a 5" vertical boiler, and fitted wood cladding, then it stalled again! Now I want to varnish the cladding. It will get at least warm, so what type of varnish do I use? The water based stuff is easy, but will it stand the heat

Brian Wood17/02/2022 12:47:55
2742 forum posts
39 photos

Duncan

Try Bourneseal, if you can buy a small quantity, it is not water based and should be good to at least 80 C

Regards Brian

John Rudd17/02/2022 12:55:57
1479 forum posts
1 photos

Duncan,

You could use varnish as used for transformers and motors from Brocott.co.uk

 

https://brocott.co.uk/electrical-insulating-air-drying-varnish-250ml-clear/

Good for temperatures in excess of 100C and they sell in small quantities…

Edited By John Rudd on 17/02/2022 12:58:07

Baz17/02/2022 14:43:27
1033 forum posts
2 photos

At the start of lockdown I bashed out a couple of small vertical gas fired boilers and lagged them with the usual wood strips. The only varnish I had available at the time was Ronseal polyurethane satin so they both got a couple of coats of that. Both boilers have been steamed for the amusement of the grandchildren on at least a dozen occasions and the varnish is as good as the day it was applied, The varnish is turps / white spirit based, not the water based stuff.

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