I've been using RC-3 for a few months with no problems. Recently, I got some Alumilite White, and have cast a few parts without problems. I noticed the other day that the bottom 1/2" of the Part B bottle was cloudy. Is this normal? I use a disposable pipette to draw the liquid out of part A and transfer to a mixing cup, then drop the pipette in the trash and get a fresh one for part B, so I don't think I accidentally contaminated it with anything. I always put the cap back on right afterward.
I honestly don't recall if it was this way when I bought it. I bought it at Hobby Lobby - is it possible it "went bad" sitting on their shelf for too long? I have no idea how much of this stuff my local Hobby Lobby sells.
Cloudiness does occur from time to time with the part "B" ......what I do is vigorously shake the bottle for a couple of minutes, rotating it from top to bottom (cap up=top, cap down=bottom)before doing anything else with it. The separation of the elements (lighter elements floating on top of the heavier elements) is what is happening thus giving a cloudy appearance.
The chances of any Alumilite product going bad sitting on the shelf too long has been debunked.
Thanks! Yeah, I read your article about that first, and your comment here makes me feel a lot better, especially since the parts I'll be casting only take a few ml of resin to cast, and I don't expect to be making a whole lot of them - so I may be using this same bottle a year or two from now.
Yup Brian is our "record holder" of having the oldest containers of resin so you won't have to worry about having year (or so) old bottles and I've found that shaking the daylights out of ALL the products (both resin and mold material) seriously makes a difference in how they perform. And I keep separate paint stirrers for all the products I use that are of the larger containers like the 5lb (each) tubs of Plat 25 I use all the time and I make sure to stir them for a couple minutes at least every time I use them.