On 25/09/2019 10:35, Chris Hogg wrote:
On Wed, 25 Sep 2019 10:29:13 +0100, Primrose wrote:

We painted some of our fence panels last year, today I noticed that
there are rusty coloured growths on the painted panels which are
slightly raised.

Does anyone know what this is please?

Sounds like a fungal growth.

Put up a picture on an image-hosting web site, and you'll get an
informed response.

What did you paint the panels with? Did it contain a wood preserver of
some sort, or was it just a fence and shed paint, unspecified?

Thanks for your reply.

I used Cuprinol Garden Shades.

Just took a snap of it.

https://www.dropbox.com/home?preview=fence_panel_1.jpg

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I'm a sew and sow!