T' next step be t' most tedious in finishin' your rocket, ya bilge rat, but a vital one. Blimey! Sandin' t' primer and gettin' a smooth, matey, bump-free finish is o' utmost importance when a smooth, matey, glossy topcoat is desired. Well, blow me down! T' paint-sand-paint-repeat technique can be used for any rocket, low t' high power.