Easiest way to check is to wet the wood. Any marks will show up when it's wet.
Why are you forced to use the solid stain?
Long story, deck was built in 2005 by the previous owner. Not being 100% sure what they used, it looked like (yes, beleive it or not..) a primer and then a solid. So a year after we bought, in '09 it started to peel and show wear. We hired soemone who did a bad job, we guess. (or is it all because of the initial coat? I think we'll never know.) the contractor scraped a little, sanded a little (areas I guess that showed wear), he primed then used BM solid acrlic deck stain. (we purchased the paint) This year it had to be done, but it wasnt in our budget to hire someone to strip the entire (700+ sq ft, plus spindles, hot tub surround and 2 areas of stairs) Both of us being handy (we have renovated and rehabbed, electric, sheetrocked. Our last house we hired and watched and learned more)
Back to the deck. We cant strip the entire deck including spindles, the spa surround and benches, under and behind the hot tub itself and under the entire perimeter (about 1/2"-1" in some places), its impossible and I dont want to spend the entire summer making this a 3 month project. DH already sanded the entire floor and stairs, it looks amazing and it going to be very tough to cover it with a solid.
But, logically it works for this year- and I hope to get 2 yrs from it.
Im sure I left some details out. I have tons of pictures I should really post.
Today.....we stain. I know with semi or transparent you backbrush (?), you dont have to with solid, do you?