RE: carbon fiber install question
Everything Steve said is on the money.
A couple additions if I may. You may purchase West Systems epoxy at various places, such as CST Sales, ACP, or Aircrfat Spruce and Specialty. The only "negative" is the fact that the smallest quantity is a quart. But this stuff doesn't really go bad so it's usable for many years. The hardener is also stable as long as it is tightly sealed in storage.
If you do go to AS&S website, look up something they call Poly Epoxy. It is extremely strong stuff and is much less expensive than the premium epoxies. A point about mixing epoxy....mix it well with a stick and then with a brush like a solder paste stiff bristle brush. Pay close attention to the ratios of resin to hardener. Weigh out if you can
US Composites and CJ Composites also sell pretty good epoxies as well as carbon, kevlarand glass cloth, at very reasonable prices. You want to use the slower hardener as Steve mentioned. For a 40% landing gear mount repair, stay with carbon. It's the strongest by far
It sounds like you have a source for the carbon cloth and/or carbon sheet. For a 40% IMAC plane I would use a couple layers of 3K cloth. Wetting the cloth is not a big deal but is very important to be thorough for full strength. Place the material inside a large ziploc or similar bag and roll the epoxy into the weave, rolling on the outside of the bag. Makes much less of a mess and makes certain the cloth is saturated. Don't squeeze too much of the epoxy out of the cloth but you don't want it dripping either. Leave it rest for 10 minutes to make the cloth easy to fashion into whatever shape you need. 3K cloth will not go into deep, sharp, concave corners easily by itself. You should first build a rounded corner (like a fillet) with some of the paste Steve described and then follow up with the saturated cloth.
Cabosil is a good thickener. To add some strength I often will chop either glass or carbon scraps with scissors and admix them into the epoxy/cabosil mixture. The cut length is fairly short less than 1/4". It should take the look of wet cat hair. After placing the mix on the formers or reinforcing doubler corners, I would addsome strips of of 2 ounce cloth over the top to hold everything in place while it cures. Good luck with it