I have patched the cracks with wood filler. It’s a strange, rubbery substance that crumbles a bit while applying it. I didn’t have a proper tool for this, but an old gym card worked just fine!2015-03-08 12.08.34

I’ve also sanded down the rusty metal with wet sandpaper. It has a completely different feel to it once those layers of dirt and rust were washed away, though the bare metal worries me a bit. Since it will see a lot of wear, I don’t think it can really be protected by paint, so I’ll just have to oil it well and keep it away from any more rain.