Newly painted fence gone to pot 😩

Hi all, any recommendations would be greatly appreciated. Recently moved into a new property. I painted the shed and fence panels with appropriate paint 2 weeks later it looks 10 years old. We have huge slugs and snails and it seems their teeth are just as big as there are trails all over the shed and panels where the new paint looks like it's been gnawed off. I have re painted again but wondered if there was anything further I could do to help prevent having to repaint. I don't want to use pellets or anything as we are lucky enough to have hedgehogs and lots of birds visit. Thanks in advance.
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Some work better than others, and it also depends on the condition of the material you're applying it to.
Slugs/snails aren't the problem. If they were, I'd have no paint left anywhere
I give all my timber a quick touch up every spring though, as it gets weather beaten over winter, and worn by plants moving against it. It doesn't take long as it's mainly the most visible bits that get done, and it sets it up for the rest of the year.
I have trellis on a lot of my fences, and the snails hide in behind that during the day, but they don't do any damage to the timber. I dispatch loads of them every day. You can see snail trails regularly, but it's just slime, not the paint being removed.
I've just been renovating one short section - I lost count at 14 of the big snails we get
i moved into a Cottage with a tiny garden, no plants in it yet- it has a white painted wall, an the back of the house is white, so decided to continue the white on the fence, and painted the shed a soft pale green.
i used Cuprinol, and followed instructions, but now where the weather has got to it, there is lots of gingery brown staining. Even on my brand new little arbour/ seat that I also painted the pale green! I don't know what's gone wrong, and I'm happy for it to slowly weather a bit, as plants grow, but it's only been a few months! ☹️