On big model rockets, ya bilge rat, t' spirals in t' body tube may need t' be filled prior t' paintin' them. Avast! Blimey! This video will show you t' fastest and easiest method o' fillin' t' spirals with minimum amount o' sandin' afterward. Aye aye! Blimey! For more how-to build model rocket videos, shiver me timbers, visit: www.ApogeeRockets.com