I've done a few of these. Some of things to add to the other advice.
Use west system 6-10 and have two tubes on hand. This stuff will give almost an hour before it starts to gel. Important to let the boat cure for at least a week before moving it.
I don't use a dam around the holes. I let the epoxy squeeze in there to fill any gap between the bolt and the hole in the beam. I will do a circle of epoxy around the bolt hole about a half inch away from the hole so the amount that gets in there is not excessive.
Before starting this I put the boat on the ground on a couple 2x4's or 4x4's that are a little wider than the boat, spaced far enough apart so the hulls are stable but don't touch the ground. Get a long level 4ft min. Remove the tramp. Loosen the dolphin striker. Check the level of the front and rear beams. Move the 2x4's fore /aft at the corners until both beams are level. It helps to do this on fairly level ground. You can check squareness of the boat by measuring front outside bolt to outside rear bolt on opposite side. Measure both ways see if they're the same.
Tape the beams and hulls leaving a small gap 1/8". Pull one beam at a time and sand the beds and wax the beams. I've used pva on some boats instead of wax. With pva I spray a couple very light coats.
Coat the bolts with Tef-Gel. I use about half the tube of 6-10 per bed. For some boats this may be excessive but for some it may not be enough. Keep in mind the tube of 6-10 is not as full as it appears. The piston is almost half the length of the tube. The tube will put out a 1/4" bead for about 20'. If your hull is a foot wide and you lay a 1/4" bead every 1/2" across the bed you'll be using 1 tube per beam.
Install the beams and tighten till the bolts are snug. Check level of the beams again. Make sure they are both level. Tighten the bolts a little more. Clean up and leave it alone for a week. Then tighten the bolts the rest of the way. Don't forget the dolphin striker.
Understand, most epoxys cure to about 90% in a week, 99% in a month. It's a waste of time and money to do this if you can't let it sit for a week.
