Should I use a J-Channel or starter strip of vinyl siding for a shed sitting on a cement pad?

I had someone tell me to use a J-channel, but I am not sure. The shed sits on a cement pad so the J channel would nearly be right on the cement. I am concerned about rain falling in the j-channel and not being able to get out. Thanks!

How do I apply starter strip for vinyl siding?

I am trying to keep it straight around windows, doors and a garage door, on one side of the building. I keep coming up short on the far side of the garage door.

Shawnee Home For Sale – Perfect Starter Home

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Vinyl siding J channel(Not Starter Strip))–installed wrong staples loose put not in factory hole–

Iam travels in Dirk’s memory to Manhattan in the late ’80’s–Iam is very disillusioned by America’s bad behavior–replace siding and j-channel–Thick as a Brick –Jethro Tull–CORRECTION thats not starter strip its the ending J-channel–all love expected