What I meant by that was,
1) There can be no previous stain on the deck, since RS is penetrating. In other words, no half %#@ cleaning jobs
2) Test wood with moisture meter prior to sealing to be sure it is dry enough ( 12% moisture or below)
3) RS is very thin........so, if you intend to spray, you need good overspray protection.
I wasnt referring to meticulous sanding, or anything like that.......although that is an option if you so choose.
Hope that cleared it up for you.