I'd recommend scraping the bad ones and starting over. My guess is that it isn't a bad ratio, but rather insufficient mixing. The rule of thumb I've been told is "If you think you've probably mixed enough, you're about half done."

What kind of temperatures have they been in?

If it is anything <70ish, I would keep them in a 70-85 degree area for another day or 2 and see if they harden up. If they don't, then I would go with Adrian's advice.

The rockets stay in a room that is about 65 F. I'll keep this one somewhere warmer for a day and see how it looks tomorrow.

Thanks for the advice guys.

I've had this happen with West Systems myself, again due to insufficient mixing. I usually mix for at least 60 seconds and I really work to get all the corners and crannies of my container well stirred up.

When it happens, I try to remove as much as I can - usually by wiping things down with acetone. If you can't get all of it that way, you can try heat setting the remainder by heating it up to around 120 - 130 degrees for an hour or two. I've used my wife's oven on warm and then leaving the oven door open a bit. That should do it.

Warren

The fresh-laid glass was very sticky on my 4" minimum diameter project. I was quite concerned. I let the works sit in the garage on a hot summer day, and that took care of a lot of it, but not all the tackiness was gone. I then determined I'd try the acetone thing, which (for me) did not work. In the course of rubbing the acetone into the finish, some of the rag I was using got caught up in the glass. After a day or two I used a garden hose to clean off the rag fibers.

Incredibly, whatever happened with the hose and water did the trick. As far as I can tell, there is exactly zero reason that the tackiness went away due to the water. That said, it DID go away and I flew the rocket on a full M and the fins are still on there. Weird.

My advice is to try heat (65 deg F is not enough), then try acetone, but I'd try the water thing, too. As noted, there is no chemical reason this should work -- but it did in my case. Strange.

In that case, the stickiness isn't uncured resin, but something called Amine Blush. A sticky, waxy-ish coating that occurs sometimes on epoxy cured below normal temps or in high humidity. Harmless and should come off with a good scrubbing of soap and water.

Warren

Use a green scrubby and mild soapy water.

I wouldn't do ANYTHING until I tried to let it cure in warmer temps. Heat lamp, perhaps?

It is minus 6 (with gusts to 43mph) in Iowa tonight. No epoxy will cure in my garage tonight 😯 Spring seems like a L-O-N-G ways away!

I wouldn't do ANYTHING until I tried to let it cure in warmer temps. Heat lamp, perhaps?

It is minus 6 (with gusts to 43mph) in Iowa tonight. No epoxy will cure in my garage tonight 😯 Spring seems like a L-O-N-G ways away!

You keep that weather there!!!!

We have a balmy 15 degree low with 20mph winds!
Much nicer here! 😉

Please do not laugh.

I have had this happen a couple time. Flour. Yes Flour.

Sprinkle it on. lightly rub. Blow off exces and wipe down.

Please do not laugh.

I have had this happen a couple time. Flour. Yes Flour.

Sprinkle it on. lightly rub. Blow off exces and wipe down.

How about talcum powder?

probably so

Please do not laugh.

I have had this happen a couple time. Flour. Yes Flour.

Sprinkle it on. lightly rub. Blow off exces and wipe down.

How about talcum powder?

The butt of the rocket would smell good too!

Thanks for all the replies on this. I left the rocket in a warm room for a couple days and the fillets on these 2 fins were still sticky - in fact, soft. Since they were soft and not just tacky on the surface I scraped them off and put new fillets on.

Thanks again, all.

- jeremiah