As far as I know Minwax doesn't make shellac.
Zinnser Bulls Eye is the premixed brand normally available. It comes in a 3 lb. cut which is too thick for brushing on, as you have found.
It should be thinned with denatured alcohol. I never brush shellac, I wipe on or spray, thinning to a 1-1.5 lb. cut.
Desired cut Mix in a separate container r
3-lb. to 2-lb. 2 parts alcohol + 5 parts shellac
3-lb. to 1-lb. 3 parts alcohol + 2 parts shellac
2-lb. to 1-lb. 1 part alcohol + 1 part shellac
Brush: For best results use a natural bristle or high quality synthetic bristle brush. Apply a full brush load of shellac to the
surface following the wood grain and using full, even strokes. Shellac begins to dry very quickly so do not over-brush.
Wait until shellac dries before touching up areas that may have been missed. Subsequent coats will blend any touch-ups
into the overall finish.
Wiping: Use a lint-free cloth, folded to form a pad. Pour a small quantity of shellac onto the cloth and wipe smoothly into
the wood. Stop wiping when surface is evenly coated and begins to feel tacky.
Sprayer: May be spray applied using conventional, HVLP, or airless systems. Use a .011 to .013 tip and 80 to 100 psi for airless spray application. Follow equipment manufacturer’s instructions. http://www.rustoleumibg.com/images/t...h%20Sealer.pdf