On 09/03/2021 11:40, fred wrote:

I'll explore the Sikkens range. I have used their products in the past

If you go to a Dulux decorator centre and tell them what you want to do
they will be able to advise on the options and prices. You can always
walk away again if the options are too expensive.

Sheds tend to have rubbish grade products in that simply don't last.

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Regards,
Martin Brown