Sounds like you disks are lasting a little longer than mine. I'm buying mine from a local paint and body supply shop in my town. They are a green color disk with the velcro backing. He breaks up 100 packs into 10 packs and they sell for $6.99-$9.49. It seems one disk can let me do about 2' of area lengthwise on the blue before it starts not cutting real well. I went through nearly 30 of the 600 grit already for one side of the boat.

Interesting that you are finding not staying as wet/rinsing is working good on the surface. I've been using one of those quart sized pump sprayers and I mist, then start sanding. As it seems to dry a bit I partially rinse and wet a little. I might have to try seeing if rinsing the disc, not the boat works well.

Seems I have my speed a little higher than yours. Mine does spin slightly along with orbiting.

Looking forward to seeing pics.