I've had my shed up for about 2 years and today I noticed a thin cracked line down the right side door. Can't see any cracking anywhere else. It's superficial but I'll need to protect it before it gets worse. What's the best remedy? I've not yet coated the shed since it was built, so I'm guessing I need some Ronseal or something, and will that stop the wood cracking further?

I put a coloured line around the crack area

Close up at top of crack


I put a coloured line around the crack area

Close up at top of crack
