MAS epoxy question

[alan white]

Just came across some MAS resin and hardener. It was left here by a friend years ago, probably six or seven years old. The resin hasn't any cover on the plastic can, but the retail tag sticker says resin. It has a pump, but the pump is shot. The hardener pump is shot as well.
Hardener still has the label attached, and it says it's #2072. The label says nothing about ratio however, which i need now that the pumps are shot.
I seem to recall MAS used a 3:1 ratio, but maybe I'm wrong about that.
Both resin and hardener are a little milky, though I've not ever noticed any shelf life limitations in my own experience. Perhaps MAS does look milky anyway. Never used it before. If I can use this I've got most of a gallon.

Alan

[KnottyBuoyz]

I think MAS epoxies are 2:1 resin to hardener. Almost all resin manufacturers advertise a 1 yr shelf life. Not to say that they won't work past that time but their performance may suffer but I don't know to what degree. I would suggest doing a test. Warming the resin and hardener might get rid of the milkyness.

[alan white]

Thanks. Maybe I'll drop the containers in pan of hot water. i've used West System that was pretty old, even red in color (hardener) with no problems.
I'll then try 2:1.

Alan

[JRL]

I would almost guarantee the hardner will be bad.

[alan white]

We'll see. At least I don't hear you saying the resin will be bad, and there's plenty more of that anyway. At 2:1, I'd need a half-gallon, which must be how they sell it. The hardener I have is in a gallon container, and has about half the amount of the resin. Later today, I'll know. It's slow hardener, so maybe tomorrow.

Thanks again, guys.

[PAR]

Agreed, that the hardener will likely not generate the properties in the cured plastic, fresh would. I wouldn't speculate how much of a difference (if it hardens at all), but I've used hardener a few years old and it worked (non-structural application) and hardener that was several years old and it didn't kick completely. If it was me, I'd not waste the resin hoping to getting lucky with the hardener.

[alan white]

I give it one shot. Small portion, carefully measured. The use is going to be for sealing more than structural anyhow. Thought i'd use it ip for that--- filling seams thickened some, and screw holes, building volume, etc. Nothing involving any stress. Stuff that gets covered with cloth and fresh epoxy from my dwindling West Syetsem supply.

Thanks.

[DGreenwood]

alan

Just a heads up...MAS changed their formula and their pumps a number of years ago. You should check out the ratio with a phone call to them.

[alan white]

Thanks for the heads up!

Alan