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Ali Webber
Joined:
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27-May-2009
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Started On : 20-Mar-2010 at 11:23:30 PM, #Views : 5830
Topic Subject : Lines, airbubbles, alginate and more |
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Wondering if anyone has heard of turning alginate mould upside down and leaving overnight for excess water to drain out of so that lines do not appear in the cast once plaster has been poured.(Ie hand that has been moulded in jug) I have been googling, trying to find some better techniques and came across this. I thought that this would cause alginate to shrink too much.
Also has anyone else used bayer chromatic alginate? If so whats your experience - it is just a general fast setting alginate. This is the only one i have ever tried perfect for babys hands and feet but i have been using 100grm alginate to 1 cup water, this is what i was taught, creates quite thick mix but then noticed some people use much thinner consitencies. Does it vary much with different alginates or are all the chromatic ones generally the same? What do other people tend to find works for babys hands and feet please do not use pounds im not familar with them!!!
I did a cast the other day of a friends hand that he has shaped accordingly for a pen holder but not only got air trapped in fingers also got TERRIBLE lines near wrist. Will re do - but thought i would research again and see what new techniques i can try so i can be more hopefull of a quality finish.
Im going to buy a paint mixer to mix my alginate smoothly - see if that assists. Also maybe try slightly runnier mix. I poured the hydrocal into the mould and then slushed around but didnt seem to help in overall finish.
Whats everyones thoughts on wetting the hand first before putting in alginate and just drying off little then putting in alginate. I have had some people tell me this achieves nothing so some professional advice would be wonderful.
When making up plaster are thicker mixes any better than thinner ones, i was taught to keep adding until a little island is created and all the water is absorbed with plaster. Is there a better way to mix plaster currently just use spatula gently trying not to capture too much air.
Thankyou all for your help to date, much appreciated this site is absolutley wonderful and have learnt many many things. So thankyou for all your input
Ali
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