Fender Boards

I wouldn't dream of buying new, and certainly not plastic, it would ware away in contact with a well barnicaled wall and probably not thick enough to withstand a good bounce against a Pile.
A tip: source one thick enough to allow you to drill through vertically to attach your ropes so they don't chafe against a wall (4"x2½") would do.
 
As a definite Scot, I’d third the motion of whatever is available free. I’ve got an off cut of decking timber.
 
Not plastic, for the simple reason that some of it will be abraded and end up in the sea as plastic particles.

Scaffold boards are good, we bought a 2m plank from an Italian DIY shop for around €10 that doubles as passerelle for when we have less agile visitors that struggle clambering up our bow. Even slapped on some leftover (rubbish) varnish, although I don't expect it to last long.

If you see a company erecting a scaffold in your area, stop by and ask for a spare scaffold board, they're likely to let you choose a nice one off the back of the truck for a tenner or a few beers :)
 
Agree wi' the use of redundant scaffold boards. They're of selected wood, so stronger than you might think.

Many baulk at the problem of stowing one which is large enough. There's a solution - which makes 'em foldable.

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Hanneke Boon/Wharram

It holds their rudders on, mile after thousands of miles. It works. It's robust. You need just another fender.
 
I used heavy duty pvc pipe from builders merchants. It then stores neatly on deck as I put them over my two whisker poles which lie flat on deck. Our boat is 17t and they're easily strong enough. Much better than wooden boards in my opinion as strong, roll with swell and light weight. Like this:

 
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