L1 in my future

I have had good luck with West Systems using the plastic metering pumps (an alternative to weighing out resin and hardener portions) and adding colloidal silica for thickness for fillets and other places where I don't want the epoxy to run too much. This gives you total control over the thickness (just keep adding silica until it's "just right").

Epoxy is one of those topics that can get near-religious type fervor generated when rocketeers discuss it, but, as Alex mentioned, unless you're doing some extreme flying it will all be adequate if your technique is decent.

I do not want to be in the weighing business, so a system approach sounds much better. Any preferred vendors?

As to 'extreme flying', my goal is to build a very solid rocket that could hold up under higher powered engines than the H I plan to use for cert. So I want to go beyond 'adequate' and approach 'great'...

I bought it at a marine supply place in Worcester. There are some West Marine stores around too, and I assume they carry the epoxy line. I have used the 206 hardener and the 406 filler. I think the pumps come separately.

Also, take special care with epoxy on motor mounts and motor retainers. Some epoxy can become soft at 120F. HPR motors may become much hotter than this on their exterior. JBWeld epoxy can withstand high heat and something like this should be used on motor mounts around the motor and retainers. Ask my son ... his retainer came unglued on his first Jr L1 attempt. Curtis