Many builders decide to put the door seals on the fuselage side instead of onto the inside of the door. Two McMaster order numbers are being used: 1120A311 (lip on inside, 3/16 edge thickness, 3/8 high): 1120A311 and 1120A313 (lip on outside, 3/16 edge thickness, 3/8 high). Since you are building up the inside edge, the lip is better to be on the inside as the groove for it will automatically form when using a throwaway seal as mold. Some builders prefer the 1120A411 variant which is for 1/4 edge thick edges. Builders usually sacrifice one set of seals as mold to form out the edges, then replace it with a clean second set. This procedure will need 100 ft total. See also: