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Post by doctortrombone on Jan 15, 2024 12:14:22 GMT -5
I'm casting a horn button for an MG. It has raised letters with mirror silver leaf on them. I need to be able to apply a water-based adhesive to the letters, so I can apply silver foil. The foil I'm using sticks to the adhesive firmly enough that when you lift it, the silver transfers over--kind of like old-school plastic model decals. The problem is that the adhesive doesn't stick firmly to the silicone, and I end up lifting the silver foil and the adhesive, leaving nothing behind. It also tends to bead up, instead of spreading over the surface.
I tried adding loctite to the bottom of the mold where the letters are, but it interfered with the curing of the silicone.
Any ideas what might work to provide a surface that the contact adhesive would stick to?
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Post by tlctugger on Jan 16, 2024 21:40:59 GMT -5
I'm casting a horn button for an MG. It has raised letters with mirror silver leaf on them. I need to be able to apply a water-based adhesive to the letters, so I can apply silver foil. The foil I'm using sticks to the adhesive firmly enough that when you lift it, the silver transfers over--kind of like old-school plastic model decals. The problem is that the adhesive doesn't stick firmly to the silicone, and I end up lifting the silver foil and the adhesive, leaving nothing behind. It also tends to bead up, instead of spreading over the surface. I tried adding loctite to the bottom of the mold where the letters are, but it interfered with the curing of the silicone. Any ideas what might work to provide a surface that the contact adhesive would stick to? Do you have a photo of the original version you're trying to match? The ones I've seen look like a metal casting with resin poured into it, then polished. Attachments:
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Post by notoes on Jan 20, 2024 13:43:29 GMT -5
If you already have the mold made, spray a clear primer inside the mold and let it dry. Once it's dry, then pour the resin in and let it cure. Once you demold, the surface of the resin has primer on it which will allow you to bond the foil to the surface like you need. The primer is what allows things to stick to the resin surface and you could spray it on as soon as you demold but the casting would need to still be warm from curing and that's a small window of time to catch so it's easier to spray it inside the mold instead so that it bonds easier to the resin. I hope this helps.
Now remember NOTHING will stick to silicone except silicone so you're not actually bonding to the silicone, you're trying to make a bond with the resin you are pouring into the silicone so the primer will not actually be bonding to the silicone, just creating a coating until it is bonded to the resin and removed from the mold on top of the resin.
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