I have a <5mw green class III laser pointer mounted on my refractor, and got curious as to how the the Seestar solar filter would work against it. Well, I found out.
Don't do it, it will trash the filter.
I have other solar filter material to use as a replacement in the holder, so no big loss. The result was interesting, and I didn't expect it. The replacement material I have isn't suitable for visual use but works for photographic use. It is thicker than the Seestar filter material. As a comparison, I did the same "test" with a scrap piece of the material and it did not have the same result.
Here are 2 pics from the "experiment". One shows the filter as a whole, and the other is a close up of one of the areas that was subjected to the laser.