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Hitch
Senior Member
Joined: 16 Jan 2006
Posts: 2429
Location: Somerset
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 Posted: Sat Jul 12, 2008 2:20 pm Post subject: Casts |
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I have been asked to do a plaster casting for someone.
Ive got what will be used as a mould, thick vacum formed plastic, just need to knock up a frame to keep the edges straight.
I need something that will let the plaster come out with ease, but wont inhibit painting of he finished item. I imagine spray silicone grease or similar would be ideal, but would make it difficult to paint...
Anyone done this sort of thing before?
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Hoovie
Devon DIYer
Joined: 27 Jul 2007
Posts: 7773
Location: East Devon
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| Posted: Sat Jul 12, 2008 3:05 pm Post subject: |
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How about PTFE Spray applied just before the pour?
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 4658
Location: Bath
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| Posted: Sat Jul 12, 2008 3:15 pm Post subject: |
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I would try one without anything first. It should just pop out when you turn it upside down.
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Wood Magnet
Senior Member
Joined: 07 Feb 2006
Posts: 3550
Location: sunderland
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| Posted: Sat Jul 12, 2008 5:51 pm Post subject: |
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cliing film 
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leebwk
Senior Member
Joined: 01 Dec 2006
Posts: 827
Location: Oxford
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| Posted: Sun Jul 13, 2008 10:16 am Post subject: |
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Maybe anything thats water based and can be wiped down after
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ultimatehandyman
Site Admin
Joined: 16 Jul 2005
Posts: 9278
Location: Darwen, Lancashire
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| Posted: Sun Jul 13, 2008 10:37 am Post subject: |
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I bet Victor has done this before, I am sure he will know what is best to use.
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joiner_uk
Senior Member
Joined: 08 Apr 2008
Posts: 256
Location: Sheffield
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| Posted: Sun Jul 13, 2008 7:26 pm Post subject: |
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Fairy liquid but thats just a guess, well it works with cement 
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Hitch
Senior Member
Joined: 16 Jan 2006
Posts: 2429
Location: Somerset
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| Posted: Tue Jul 15, 2008 5:33 pm Post subject: |
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Well, in the end, i went with a very light squirt of dashboard shine, on a cloth. Turned it out tonight, a few pats with palm of my hand and out it came. Nice and smooth.
A very light rubdown before painting hopefully will get rid of any remains of the silicones prior to painting.
Reckon i'll need to leave it about a week or more before its fully dried.
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rotciv
Senior Member
Joined: 05 Apr 2008
Posts: 322
Location: Malta
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| Posted: Fri Aug 15, 2008 11:44 am Post subject: Re: Casts |
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| Hitch wrote: |
I have been asked to do a plaster casting for someone.
Ive got what will be used as a mould, thick vacum formed plastic, just need to knock up a frame to keep the edges straight.
I need something that will let the plaster come out with ease, but wont inhibit painting of he finished item. I imagine spray silicone grease or similar would be ideal, but would make it difficult to paint...
Anyone done this sort of thing before? |
i have made plaster moulds of several objects made from different materials. in your case a brush over the mold of undiluted dishwashing soap would probably do the trick. i have even used turtle wax car polish as a parting agent between plaster and plaster.
victor
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