I hate to lecture but, sanding sealer is used for preventing blotchiness, it is applied before staining, mostly on pine woods etc. Take note that some sealers act like solvents to stains, best is to test it on a scrap before using.
Its not worth bro. I bought a house without sump pump, thinking it was a good deal, turns out It would haunt me in the long run. After a crazy storm, my basement got flooded. Getting a sump pump after the house was finish constructed will make you question your decision making. ☹ Its not about...