here is a post from another site where the builder tracked weight gain: 9 oz's or so? compared to 4-5 ozs of monocote? doesn't look to bad.
david




I just finished covering my Top Flight GE P-51 (1/7th Scale). I wanted to know what type of weight gain I would get so I bought a gram scale before I started building. Below are my results after finishing.

I'd like to know how much total weight gain I would have gotten with other covering methods, especially monokote. If anyone can tell me I'd appreciate it.



P-51 Build Weights in Grams (1lb = 453 grams)

Note: Covered with .75oz FG cloth and Polycrylic Water Based Acrylic. Painted with Behr Metallic Silver Acrylic and Nelson Hobbies Water Based Polyurethane.

FUSELAGE:

Sanded Fuse Ready to Cover: 1069
Glassed with .75oz FG and Polycrylic WB: 1125
Bondo 907 and sanded: 1134
1 Coat Primer (unsanded) : 1272
Primer Sanded: 1180
Cockpit added: 1257
2 coats Behr Silver Acrylic: 1282
Paint (all colors) complete 5-6 coats WBPU: 1300
With clear coat (3 coats): 1319

Total gain from glassing and painting (fuselage): Approx. 170 grams

WING:

Sanded Wing Ready to Cover: 1035
Glassed and primer (sanded): 1083
1 coat Behr Silver Acrylic: 1090
All paint added (5-6 coats Nelson WBPU): 1128
Clear coats added (3-4 coats): 1152

Total gain from glassing and painting (wing): Approx. 117 grams

TOTAL GAIN FROM COVERING (ENTIRE AIRCRAFT): 287 Grams / .63 lbs