Post by Bill from NH on Nov 16, 2020 9:18:48 GMT -5
I want to create a two layer cast with the bottom layer mixed with some pigment and the upper layer clear.
What's the proper way to cast a multi layer pour ? I don't want to risk separation of the layers while also eliminating air bubbles.
Do I do the first pour, put it in the pot, wait the recommended demold time then repeat the process for the second pour ? I thought I read that the resin (the second layer) wouldn't stick well to itself (in this case the first layer fully cured).
Or, do I do a first layer, put it in the pot, remove it before it reaches the demold time, but soon enough so the second pour won't mix with the first and then put the entire thing back in the pot for the complete demold time of the second layer ?
I'm just starting out with epoxy resin casting, and that's my next project. Seems to me the only problem would be color bleed from the top layer into the bottom. From what I've seen on YouTube, the first layer should be poured and allowed a short period of time to set up (not cure). Depending on the resin, it could be a few minutes to a couple hours. Remove bubbles then pour the second layer.
Wouldn't it be great for someone to publish a book that answered so many of these questions for us beginners?
Once you are past the "open time" you should be fine to pour the next layer. I'd say you could also wait until it's almost cured to do another layer if you're worried about color bleeding.
Alumilite has some great videos on their website and YouTube just for beginners. But it's also what we're here for - people who use the products all the time help the beginners. Each of us have different areas we are good in and can help in.
You could pour the next later while the first is still tacky and the two will stick together nicely. If the first layer has cured, scuff it with some 220 grit, vacuum and use an air compressor to remove all the dust, then do your second pour. The scuffing will help the two layers bond mechanically, not chemically