MadMike
Well-Known Member
Okay guys, i wanted to write about this project when it's finished, but i guess i need your help to get there :lol
but here is what happened: i have a wine-bottle which is a quite good replica of the Fifa World Cup Trophy. Now i wanted to make a mold of the bottle and make a replica of it (without the bottleneck) with plaster, to give it a realistic weight. as this is my first mold-project, i decided to keep the costs low and use silicone caulk.
i wanted to make a three-piece mold, so i started by building a claywall on the vertical middle of the bottle, with registration-keys. then i applied 3 or 4 layers of silicone (of course i let each layer dry before applying the next one) with a palette knife to make sure to get a more or less uniform coat. i ended with the registration keys for the mother mold.
after that, i scraped off the claywalls and wanted to apply silicone to the other side of the bottle. as silicone sticks to silicone, i googled for cheap release agents and stuff like that, and a lot of websites advised petroleum jelly as a good cheap product to avoid the two halves sticking together. so i applied a thin layer of vaseline on the "seam" (dunno if this is the right word, but i guess you know what i mean...the thing with the registration keys on it) and started applying silicone on the other side of th bottle.
i started on friday with the first layer, always tested if it was dry, and when it was dry, i applied the next coat...and so on. i think i finished the last one on saturday evening, and i gave it time until today to get really
really dry and ready for demolding.
ok, so far, so good. i started demolding the first side (the one with that i started) and was surprised of how well the method worked out. good details, nearly no airbubbles trapped...great result!
when i removed half of the first mold, i noticed something strange: some of the silicone of the second side wasnt dry yet. it's not sticky, but neither dry. it has some kind of peanut butter consistency, but - as said - it's not sticky. very strange, never have seen this
now, my question is: can this be because of the vaseline? first i thought it was because the best-before date was expired, but it dried everywhere else, so i dont think that this is the reason. then i thought of the vaseline, perhaps i applied it too sloppy on the seam and some of it is on the glass which prevented the silicone from drying, but it dried on the seam.
as you can see, i'm a bit helpless (and that after everything started so well :cry), so if you have any idea why this happened or how to fix it, please let me know
but here is what happened: i have a wine-bottle which is a quite good replica of the Fifa World Cup Trophy. Now i wanted to make a mold of the bottle and make a replica of it (without the bottleneck) with plaster, to give it a realistic weight. as this is my first mold-project, i decided to keep the costs low and use silicone caulk.
i wanted to make a three-piece mold, so i started by building a claywall on the vertical middle of the bottle, with registration-keys. then i applied 3 or 4 layers of silicone (of course i let each layer dry before applying the next one) with a palette knife to make sure to get a more or less uniform coat. i ended with the registration keys for the mother mold.
after that, i scraped off the claywalls and wanted to apply silicone to the other side of the bottle. as silicone sticks to silicone, i googled for cheap release agents and stuff like that, and a lot of websites advised petroleum jelly as a good cheap product to avoid the two halves sticking together. so i applied a thin layer of vaseline on the "seam" (dunno if this is the right word, but i guess you know what i mean...the thing with the registration keys on it) and started applying silicone on the other side of th bottle.
i started on friday with the first layer, always tested if it was dry, and when it was dry, i applied the next coat...and so on. i think i finished the last one on saturday evening, and i gave it time until today to get really
really dry and ready for demolding.
ok, so far, so good. i started demolding the first side (the one with that i started) and was surprised of how well the method worked out. good details, nearly no airbubbles trapped...great result!
when i removed half of the first mold, i noticed something strange: some of the silicone of the second side wasnt dry yet. it's not sticky, but neither dry. it has some kind of peanut butter consistency, but - as said - it's not sticky. very strange, never have seen this
now, my question is: can this be because of the vaseline? first i thought it was because the best-before date was expired, but it dried everywhere else, so i dont think that this is the reason. then i thought of the vaseline, perhaps i applied it too sloppy on the seam and some of it is on the glass which prevented the silicone from drying, but it dried on the seam.
as you can see, i'm a bit helpless (and that after everything started so well :cry), so if you have any idea why this happened or how to fix it, please let me know
