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USG ceramical plaster consistency

pott3rm3

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Jul 6, 2025
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First time posting, long time lurker! I'm trying to figure out the optimal consistency for my USG Ceramical plaster, and I'm hitting a bit of a wall. I'm using it for molds and slumping forms, but it mixes too thick and difficult to pour. I'm curious to know what water-to-plaster ratios are you all using for Ceramical? Are there any specific tips for mixing it to get a smooth, pourable consistency? Any advice on getting consistent results would be hugely appreciated!
 
Hey, welcome! You can try a 70:100 water-to-plaster ratio by weight. Sift plaster into water, let it soak a minute, then mix gently, avoid overmixing cause air bubbles ruin detail, you should also pour right after mixing.
 
So far I've used a 38 parts water to 100 parts plaster ratio and it's been working perfecly for me for as long as I can remember. The thing is I'm going for firmer mixture, so you can play around untill you get the right one. I think 70:100 might bee too thin, but still try it.
 
First time posting, long time lurker! I'm trying to figure out the optimal consistency for my USG Ceramical plaster, and I'm hitting a bit of a wall. I'm using it for molds and slumping forms, but it mixes too thick and difficult to pour. I'm curious to know what water-to-plaster ratios are you all using for Ceramical? Are there any specific tips for mixing it to get a smooth, pourable consistency? Any advice on getting consistent results would be hugely appreciated!
one tip that would be useful for you is to go by weight, not volume. This is the golden rule for consistent plaster mixes. Scales remove all the guesswork from water and plaster.
 
So far I've used a 38 parts water to 100 parts plaster ratio and it's been working perfecly for me for as long as I can remember. The thing is I'm going for firmer mixture, so you can play around untill you get the right one. I think 70:100 might bee too thin, but still try it.
the same with me. a common starting point for Ceramical is around 100 parts plaster to 38-42 parts water by weight (e.g., 100g plaster to 38-42g water). then adjust slightly from there based on your specific batch and desired flow
 
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