i was looking at uscomposites.com and they have different ratios of epoxy resin to hardener to resin and i want to know what works best for midpower rockets. i would also like to know whether or not i should use a filler and if i should what kind?
Personally, I would go with USComposites epoxy or West Systems. For one thing, they are a lot stronger. Second of all, the are a good deal for how much you get. Third of all, the pumps(not included) make it really easy to mix. Finally, you can add things like microbaloons that make it really easy to sand for fillets. For midpower, i think you would be fine with the 3:1 medium dry time. That would be plenty strong.
wood glue is plenty strong for wood/cardboard parts and lighter
5 min epoxy might be good for making big fillets
but if you have a choice 15 minute epoxy would be a stronger glue for the same price as 5 min.
investing in west system/us composits for model and midpower rockets is quite an investment compared to a $3.00 bottle of wood glue.and a $5.00 set of hobby epoxy.
plus it saves you the money to buy more kits and motors.
what are you currently using for glues?