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balsa wood part

5 replies
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  • Member since
    July 2014
balsa wood part
Posted by detailer 1 on Wednesday, May 6, 2015 8:28 PM

can you make an rtv rubber mold of a wooden part made of balsa wood with out ant damage to it

  • Member since
    September 2012
Posted by GMorrison on Wednesday, May 6, 2015 9:37 PM

I'd paint it first with several coats of gloss paint.

Also depends on the part shape, no negatives would be helpful

 Modeling is an excuse to buy books.


  • Member since
    February 2011
  • From: St louis
Posted by Raualduke on Thursday, May 7, 2015 2:05 AM

You would probably have way better luck with basswood,and as gmorrison suggested ,heavily sealed. I would probably seal it first with some type of sanding sealer then  a coat of  gloss varnish

  • Member since
    July 2014
Posted by detailer 1 on Thursday, May 7, 2015 4:10 AM

thanks to all will give it a try

  • Member since
    November 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Thursday, May 7, 2015 8:50 AM

I always put a glossy coat on the wood part before trying to make an rtv mold of it. If there is a lot of detail, especially indentations and narrow grooves, I may put a mold release on it.  Talcum powder makes an okay mold release, but a mixture of vasoline and paint thinner is even better.  For the latter, however, make sure paint is thoroughly dry on pattern.

Don Stauffer in Minnesota

  • Member since
    August 2011
Posted by ohso on Thursday, May 7, 2015 11:02 AM

I would seal it, I never have issues with damage to the master unless its super could make a multiple piece mold, by using vasaline in between the two halves. I make alot of small very detailed parts for 1/25 scale trucks.


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