Welcome, Wild Thing
I have enlarged on the theme of identifying hedgehogs, which I will put below this. I hope you will consider trying to identify them naturally. It can be fulfilling. I, personally, would not recommend using garden furniture paint even if it is water based – it still may have other chemicals in it and potentially be smelly to the hedgehogs. I had 12 different hedgehogs naturally identified last year – not all visited every night, I hasten to add! Neither do I have any special talents. Just observation. Many of the hogs are back this year.
Good luck with your hog visitors. You are clearly fond of them.