nathan wrote:It's a totally different material to resin. I'd recommend gettting a smaller amount if you're not familiar with it or know that you want to cast something definitely with plaster/die stone.
Likely, I'll work up a few models first. That's going to take a while. I've worked with cements and plasters before....
nathan wrote:I'm heading the opposite direction. I've worked with die stones and dental plasters and am just getting started with resins (started with cheap polyester resin from an autobody supply shop).
Did you do the Hirst Arts thing? Most of the links that folks been putting up are familiar, I've been there before.
nathan wrote:The last 50 pound box of die stone I bought was like a foot wide cube. The die stone was bagged inside of that and filled the box up about 90% of the way.
THAT is the information that I needed. A "foot wide cube" is like 7.48 gallons IIRC....that's a BUTTLOAD of resin, and answers my cost question. Unless the diestones are totally unsuitable for the model in question, I'm thinking that they are much cheaper for the given volume, given what you and Jim have said.
I've also read up on casting pot metals and aluminum, but that's likely going to be overkill.
nathan wrote:Die stone feeds and feeds into water. You'll be surprised at how much a given volume of water will absorb.
As long as it's not more than 4X the water volume, you're still ahead.
nathan wrote:My general thinking is that plaster/die stone is better for some terrain and resin for miniatures. Whether or not I'd go with resin or die stone would be a decision made on a case by case basis depending on the shape of the piece and the nature of the mould.
Pretty much - unless the thing is really delicate, diestone comes out ahead in my thinking.
nathan wrote:Also, never dispose of plaster/water solutions down the drain. Always let the plaster set completely and throw it out. Sounds like a no brainer, but it's easy enough to forget and it only takes one time to block a pipe. And even a really thin plaster/water solution will cause a build up over time.
Everyone keeps telling me that.
I dump it in a trash can...might be able to recycle some chunks. Yeah, I'm THAT cheap...
thedugan wrote:I'm not questioning that it worked, just whether or not it's the most cost-effective solution.
My thinking is that for a meteor, the rotating with polyester resin to make a mostly hollow cast might be the way to go. Like the guy did with the rock casting on the taxidermy site.
I'd just cast the whole thing in plaster. Time is money...or, you could slush cast the exterior in a diestone, and fill with plaster. Can you slush cast with a diestone?
nathan wrote:Die stone is about strength rather than volume, so it takes a surprisingly high weight of dry powder to make a given volume of plaster. So as far as cost effectiveness goes, if you can mix up polyester resin in small quantities and get good results with it, that'll probably be cheaper than die stone. Die stone has the advantage of being all water based with no nasty fumes though. And it's more sandable/workable than polyester resin. Also, less heat is produced, so you can get a longer mould life.
Yeah, the fumes and ease on the molds is a biggie....