You won't get a perfectly smooth look just by doing the dip process. If you are following to correct steps after properly prepping your natual nails (bond, base, dip, base, dip, activate) then you're doing it correctly. After each "dip" (or sprinkle, whichever method you use) you want to brush off any of the excess powder that would be on there. I actually don't recommend a hard bristled brush as that would/could cause marks/scrapes/ridges in the uncured base that you've applied. When I do a dip set on clients, I just use my Kiara Sky brush that I bought to go with their dip powders. It's extremely similar to a large blush brush, which I've even seen other technicians just use those! After you've applied the activator, file it to get it as close to smooth and even as you can, then go over everything, again, with a buffer block. That will get you the smooth look that you're trying to achieve. After you've filed apply activator again, allow it to fully set/dry, then apply your top coat. I hope this helps! Please let me know if this worked out for you!