Fence colour

What ho one and all,
X years ago, my neighbour, with whom we are friendly, replaced a section of his failing fence with a new one, but it is that kinda rust red. At the time, I asked him if we could paint it a colour that we liked, and he would not agree.
The fence is still in great condition but weathered and again, I would like to paint it a mid-gray. I have yet to seek his permission so obviously, don't know his response.
But given that he never sees our side of his fence, am I within my rights to paint it without his permission? After all, it would be doing him a favour in maintaining his fence.
Thanks and toodle pip
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Doing so could be considered " causing criminal damage "
Please don't.