A person posted some homemade seed tape on another forum. He took a roll of toilet paper, put tiny dabs of school glue on the squares, spaced evenly, and used that for adhering the seeds. It sounds a bit tedious...I tend to just sow my carrots in really wide rows, so there is less thinning needed.

I read the post you're talking about, Donna. I would never go to all that trouble. I usually plant seeds the old fashioned way, but like I said these seeds were really cheap & I've kind of always wanted to try the strips. Anyway, just curious if they need to be thinned.

One of those two wheeled seed planters would probably be easiest. It would not be the cheapest though.

Yeah, the two-wheeled seed planters would be great. But honestly I'm fine planting seeds the "traditional" way.

I'm just wondering about the planting strips that I've already planted--do they need to be thinned even if the directions say they don't?

I would rely on personal judgement on if they need to be thinned. For Carrots, you could just thin small amounts at a time as they grow.