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 want 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 B & Q own stuff, whatever is cheapest and effective, and will that stop the wood cracking further? My shed panels are about 6 to 7 foot each, so need about 4 litres? I'm assuming it's not rot setting in but perhaps due to the hot weather we've had?
https://postimg.cc/image/syacnakrr/
I put a coloured line around the crack area
https://postimg.cc/image/syacnakrr/
Close up at top of crack
https://postimg.cc/image/syacnakrr/
I put a coloured line around the crack area
https://postimg.cc/image/syacnakrr/
Close up at top of crack