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Post by notoes on Jun 21, 2018 11:44:25 GMT -5
I'm gluing RC-3 castings into plastic boxes and the hot glue is failing to hold them in past the first de-molding - I'm having to re-glue them before I can do another mold. I am being very careful and using a gentle flexing motion to pull the finished mold out of the box so I don't break the glue bond but it's not working very well for me. These are dedicated mold boxes for custom candy molds made from Plat 25 and are for an order I am making, one mold is a large single casting (3"x3" mold box) and the other is three small castings in a long mold box (3"x7" mold box). The problem one is the 3 cavity one, the glue on large single cavity is holding up so far.
Also I see on the data sheet for Plat 25 that cyanoacrylate (super glue) will inhibit curing so the super glue I have on hand will not be a good thing to use which is why I'm trying to use the hot glue which isn't doing good enough. So what glue would be best to use? I am also willing to pour a thin layer of the RC-3 (or something else) in the bottom to seal any cracks the glue might not get into to help prevent any Plat 25 from getting under the casting and weakening the bond when I pull the finished molds out. |
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Post by Brian on Jun 23, 2018 12:20:47 GMT -5
I think what is happening is that the CA cures so fast that it is affecting the Plat 25 ....I've never used Plat 25, but I have used enough CA to be quite familiar with what it works well with and what it doesn't. I have been using Aleene's THE ULTIMATE Multi-Surface Adhesive on surfaces where the CA doesn't work.....even with using Bob Smith Industries products (CA) exclusively, I still run into situations where something else is warranted. I purchased it locally at Michaels.... www.michaels.com |
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Post by notoes on Jun 23, 2018 18:34:03 GMT -5
I've got Loctite Professional super glue and I'm not sure it's bonding right as I've timed it at a minute and it's still not curing right - still a bit wet sometimes. I've seen that acetone removes it but I've only got non-acetone nail polish remover, I wonder if that will work?
The only Aleene's I've got is repositionable and almost empty, I don't even think it has enough in it to spray properly. But I also have Loctite Spray Adhesive (also repositionable) but I've only used it for securing stencils when I spray painting shirts. I'll have to see if the Loctite Spray is helpful at all, I'm having such trouble with this one set of molds that I've got two wasted molds and on top of that the mold box cracked and I had to go to a larger mold box.
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Post by Brian on Jun 25, 2018 21:33:14 GMT -5
...The Aleene's that I use comes in a tube...it's an adhesive glue and not a spray if that helps you any....
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Post by notoes on Jun 27, 2018 6:55:33 GMT -5
I think I've seen that, I'll have to see if I can find it this weekend. Thanks.
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Post by catspraise on Jul 9, 2019 16:43:01 GMT -5
I'm gluing RC-3 castings into plastic boxes and the hot glue is failing to hold them in past the first de-molding - I'm having to re-glue them before I can do another mold. I am being very careful and using a gentle flexing motion to pull the finished mold out of the box so I don't break the glue bond but it's not working very well for me. These are dedicated mold boxes for custom candy molds made from Plat 25 and are for an order I am making, one mold is a large single casting (3"x3" mold box) and the other is three small castings in a long mold box (3"x7" mold box). The problem one is the 3 cavity one, the glue on large single cavity is holding up so far.
Also I see on the data sheet for Plat 25 that cyanoacrylate (super glue) will inhibit curing so the super glue I have on hand will not be a good thing to use which is why I'm trying to use the hot glue which isn't doing good enough. So what glue would be best to use? I am also willing to pour a thin layer of the RC-3 (or something else) in the bottom to seal any cracks the glue might not get into to help prevent any Plat 25 from getting under the casting and weakening the bond when I pull the finished molds out. Hey Notoes! Did you ever find a glue that could be used with the Plat 25? I am currently working on a master. To get the perfect finish I am using CA glues. Now I see that will poison my Plat 25. Can the master be coated with something else, like a polish or wax, to seal the CA glue from the Plat 25? |
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Post by notoes on Jul 10, 2019 6:51:32 GMT -5
After some experiments, I found the Loctite Professional super glue actually did work but it needs to be left alone to fully cure for 24 hours before pouring the Plat 25. Though that is for just gluing the master to the box, if you're using the glue on the surface of the master then you can use one of the Clear resins and brush a thin layer over the master to seal the glue coating away from the Plat 25. You can also use the Clear to brush over the glue holding the master to the box if you want to. For sealing over the master, just know that the Plat will pick up the dried surface texture of whatever is used on the master. Just be sure not to use the Flex series resin - I learned the hard way that it will inhibit the Plat and cause a big mess. RC-3 and the Clears have no problem with the Plat. Also the Replicator 400 is supposed to be fine to use with the Plat but the Alumisol Soft Plastic isn't - I need to reinforce some plastic to plastic edges on some of my dedicated mold boxes so I asked about that.
The biggest thing I found was that the glue needs the full 24 hour cure time to do it's job and as long as the Plat can't get under the master (through any gaps between the glue on the master and the box) then it won't break the glue seal - I've got two very popular mold designs that the glue seal has held since I first glued them in place and I am not all that gentle with either of these when I demold plus they see a lot of handling due to how popular they are. And these two designs are close to a year old and still holding strong.
I hope this helps.
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