The Union of Safety for SciOly Engineers.

[TheChiScientist]

57. Always check your wiring. Other you'll be like me and have a NiMH (almost) catching on fire... (At least it wasn't LiPo)

[TheCowboyandhisArk]

58. (this one's from a coach) don't screw around with heat and spray paint cans

[waffletree]

59. Don't drip hot glue onto your leg.

[jaspattack]

60. Follow the directions and put things together the right way the first time so you don't have to rip something apart when you realize why it didn't work. Wright Stuff treated me kindly.

[JoeyC]

61. Read all the directions before doing something. All of them.

[linzhiyan]

62. Know how to properly use each of the materials you have...
Hehe, have a fun story with that...

[Things2do]

63. Don't step on your car the night before State... At ~11:30... The car was fine, the left wheels, not so much...

[PM2017]

64. Cyanoacrylate on receipt paper causes lots and lots of smoke, and some burnage.

[Creationist127]

65. If the propeller's axle hole is four times too large for the motor's axle, filling the hole with hot glue and sticking the axle through it is a great way to stick it on: it allows the propeller to fly off when your partner is testing the motor, giving them a few nasty cuts. And probably breaking the propeller.