There is nothing wrong with using a spray bottle for watering seedlings. It give you more control over how much you water rather than pouring from a container and drenching the soil. I've used a sprayer for years as have many others. They work great for watering seedlings.
Mabey for a jiffy pellet or a rapid rooter plug. But a 16oz solo cup, thats pushing it in my opinion. But I don't know anything, I'm just now starting my first grow. If it works, keep working it.
I'd really appreciate if you would stop by and check out my journal. You sound like you've got alot of experience I could pick your brain on good pointers.
I use a pump sprayer not one of those squeeze hand sprayers. They work great up to 1 gallon containers and still allow for just a small amount for smaller ones.
Now we're on the same page. A Hudson sprayer is very different than a spray bottle.
