Epoxy Basics

Рет қаралды 13,116

10 жыл бұрын

The types of epoxy, safety, mixing and application techniques for hobby rocketry. See jcrocket.com/epoxy-basics.shtml for details.

Пікірлер: 16

@chris3383 6 жыл бұрын

I use the west system for everything and use west system silica when I need it to be thick non runny ....I use the spoon method but use the bottom ....Great information look forward to more videos.....I have had one failure due to lack of proper sanding to a plywood fin just on one side it flies fine but I'm going to fix before I fly it again its a Loc Little Ditter

@epsyuma 9 жыл бұрын

John..you're awsome!!! Thanks for the video!!

@maroonedmorlock 9 жыл бұрын

Thank you for this video. What do you use to do the 'cosmetic' fillet on top of the epoxy?

@JohnLCoker 9 жыл бұрын

For cosmetic filling, I like Super Fil because it's lighter weight than Bondo.

@daviewavie112 5 жыл бұрын

Great video!

@pieman12345678987654 3 жыл бұрын

Off to Starbucks to obtain stir sticks lol

@johtib 6 жыл бұрын

You mentioned having fast curing times for structural epoxy but from what info I could find Aeropoxy has pot life of one hour. Do you use something else for structural epoxy?

@JohnLCoker 6 жыл бұрын

I use AeroPoxy ES6209 for most general bonding purposes. Pot life is long compared to Bob Smith epoxy, but cures in 24h at room temperature.

@rsilvers129 5 жыл бұрын

@@JohnLCoker Why 6209 vs ES6228 which has a higher strength?

@JohnLCoker 5 жыл бұрын

@@rsilvers129 Good question; they appear to have about the same use pattern with 6228 having slightly better mechanical properties. I suspect it was because 6209 was more available when I started, but I will definitely look into 6228 when it's time to reorder.

@ahbushnell1 8 жыл бұрын

Focus please

@pariahzero 4 жыл бұрын

I don’t see any case where you apply epoxy to the primary surface - I don’t see *any* epoxy being applied to the fin roots or the mating surface of the centering ring - I only see fillets. Why is that? I’d expect you would want to use epoxy where the pieces mate, not just tacking fillets onto the sides.

@JohnLCoker 4 жыл бұрын

I often put a bead of epoxy on the fin root when I install it, especially if there is a tight fit where I'll have difficulty with the fillets. However, the main bond is the fillets. Epoxy bonds are stronger in compression than tension so I try to make sure each part has at least one good fillet that will hold the part in compression. For fins, this is the inner fillet to the body tube. The fillets at the MMT are mostly to anchor the fin root against lateral forces (fin being pushed to the side).

@CORZER0 9 жыл бұрын

Where did you get the pumps for the Aeropoxy?

@JohnLCoker 9 жыл бұрын

Those are actually West System pumps, but they work on Aeropoxy cans as well.

@CORZER0 9 жыл бұрын

John Coker Thank you. I will look into that. And thank you for sharing your knowledge with both your youtube channel as well as your web site! Much appreciated.