This was super informative. Thank you! I will try to find this plaster rather than use plaster of paris. The math is incorrect in the video though, 2100 × 0.66 = 1386 ≈ 1400 Or 2100 × 66% Or 2100 × 2/3 (P.s. submicron particles, like in plaster, penetrate the lining of your lungs and enter the bloodstream doing who knows what, storing who knows where. Damage can be cumulative, so wearing a mask is in your best interest. I'd feel comfortable pouring outside and standing up wind without a mask, though.)
Great tutorial! I will try this. Is the ratio the same for making hump and slump mould? Also, I didn’t see you measure the plaster but rather, you seemed to eyeball it from the island level. Is that correct?
Yes I eyeball it. I use the same method for all my plaster hump and slump work although I will use the ratio method when making complex slip casting molds.
this video is both confusing and humorous. She went to all the trouble to show us the math (which still confuses me; isn't 2/3 x 2100 = 1400? ) she carefully weighs everything, but in the end does it by the seat of the pants method. I appreciate her knowledge and experience, but this video cracks me up. AND is a release agent required in the the rubbermaid container or does it the plaster not stick at all? and since this is just basically a sponge, does it really matter if there are air pockets (bubbles) in the slab?
I do the measurement to show how much water to use. It’s about 2/3 the total amount of volume of the end result of solid plaster you want. The plaster part is based on saturation. You can do this through exact ratio weights but this method works for my purposes.
The bubble removal is important if you don’t want broken bubble dots all over the top of your plaster slab or do strength. I use the slab for other purposes so less bubbles means more solid, therefore less likely to snap.
This was super informative. Thank you! I will try to find this plaster rather than use plaster of paris.
The math is incorrect in the video though,
2100 × 0.66 = 1386 ≈ 1400
Or
2100 × 66%
Or
2100 × 2/3
(P.s. submicron particles, like in plaster, penetrate the lining of your lungs and enter the bloodstream doing who knows what, storing who knows where. Damage can be cumulative, so wearing a mask is in your best interest. I'd feel comfortable pouring outside and standing up wind without a mask, though.)
Very impressive
Thank you! I hope you make your own too!
Great tutorial! I will try this. Is the ratio the same for making hump and slump mould? Also, I didn’t see you measure the plaster but rather, you seemed to eyeball it from the island level. Is that correct?
Yes I eyeball it. I use the same method for all my plaster hump and slump work although I will use the ratio method when making complex slip casting molds.
Shouldn't you have measured out the plaster vs taking it directly out of the bag?
this video is both confusing and humorous. She went to all the trouble to show us the math (which still confuses me; isn't 2/3 x 2100 = 1400? ) she carefully weighs everything, but in the end does it by the seat of the pants method. I appreciate her knowledge and experience, but this video cracks me up. AND is a release agent required in the the rubbermaid container or does it the plaster not stick at all? and since this is just basically a sponge, does it really matter if there are air pockets (bubbles) in the slab?
I do the measurement to show how much water to use. It’s about 2/3 the total amount of volume of the end result of solid plaster you want. The plaster part is based on saturation. You can do this through exact ratio weights but this method works for my purposes.
The bubble removal is important if you don’t want broken bubble dots all over the top of your plaster slab or do strength. I use the slab for other purposes so less bubbles means more solid, therefore less likely to snap.