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LaxFriedrichs
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Hello all, I need to make a two part mould of an object made of wood that's surface is lacquered, but I'm very keen not to damage the object. Could you recommend the best suited molding method for this? The piece no larger that 600mm x 400mm x 150mm. The mold should be reusable also.
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carboncactus
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I have asked this question also, However my part wasn't lacquered. If the lacquer has not only sealed but has created a surface on top of the grain, you will be ok with just waxing it. Because my piece wasn't lacquered I had to cover it in aluminium tape.
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LaxFriedrichs
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CC, your reply is much appreciated.
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Matthieu Libeert
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LaxFriedrichs
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Matthieu, I was just wondering if there was a optimal method of mould making that would be best for a laquered finish wood part.
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carboncactus
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This week I will be finished with my wooden part project. I will post loads of pics. It will be a prepreg pull. But to answer your question, just use wax, or a semi perm and Unimould. Technically, you are releasing off lacquer, not wood. Whatever material is under the lacquer doesn't matter.
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LaxFriedrichs
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carboncactus (12/06/2013)
This week I will be finished with my wooden part project. I will post loads of pics. It will be a prepreg pull. But to answer your question, just use wax, or a semi perm and Unimould. Technically, you are releasing off lacquer, not wood. Whatever material is under the lacquer doesn't matter. Thanks again. I'm considering Unimold atm, due to the size ( aprox 600mm x 400mm x 150mm). 'Semi Perm' is a semi-permenant release agent, yes?
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carboncactus
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Yep, semi permanent release agent. Solvent based semi permanent sealer and release agent if you wanted to be more exact lol. Just buy the £80 Unimould kit, some release, acetone, filleting wax, and something to make flanges with if they are needed. Don't want to be negative, but if this is your first mould, you WILL fook it up. The small kit should give you 2 shots at it. Make sure you follow the data sheets TO THE DOT. Weigh all your resins, heat the room up, make sure there is no air in the laminate, and make sure you work fast with the reinforcement resin. Too slow and 2 things can happen. It could gel before all layers are down and therefore it wont exotherm, or it will exotherm before you are finished consolidating it.
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LaxFriedrichs
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Yes, it's my first mould. My hope is to prove you wrong by following the instructions precisely, but the likely outcome is probably as you say. Prep, prep and more prep is in order so I don't 'faff' around too much.Once again your input is appreciated mate. 
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carboncactus
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Is your mould going to be subject to heat? i.e. postcured, used for prepreg? If not, you might have a completely useable mould first time. There could be air behind the gel coat, but you dont know about it until the mould is heated and the air expands, creating blisters on the surface. And if the mould is not going to be in an oven at any time, it will be fine
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