My first silnylon tent was a Tarptent Squall II. I went a bit overboard and put 2 oz. of seam sealer on it.
Since then I've seam sealed a Tarptent Rainshadow II, a SMD Lunar Solo, a GG/Tarptent Squall Classic and a ZPacks Hexamid Twin. 1 oz. added for each, including floor spots (instead of stripes) on all but the last. Hint: on the floor stuff, to keep pad from sliding you don't need to paint the floor at the bottom end, the top end or right next to the sides. Only put the sealant where your pad will hit! Spots are easier to clean around than stripes. Especially don't paint too close to the door, because that's where the most dirt will stick to the sealant!