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mold help needed

 
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glenn201
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Joined: 06 Apr 2013
Posts: 18
Location: Brazil IN

PostPosted: Thu Oct 08, 2015 6:22 pm    Post subject: mold help needed Reply with quote

ok i have made my molds from wood an coated it with bondo what can i use to seal the mold im vacuum forming polycarbonate
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kayaker43
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Joined: 13 Jun 2007
Posts: 175

PostPosted: Tue Oct 13, 2015 7:32 pm    Post subject: Reply with quote

I use Polyester resin on wood/bondo molds but you can form over bare wood for a few parts. Many paints and varnishes get tacky when hot and you have to put messy mold releases on them. Use Polyester not epoxy resin, one coat to seal with a light sanding to knock off the nubs, then a second coat or more. This puts a hard shell over the wood that doesn't stick.
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Doug Walsh
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Hobby-Vac and Proto-Form machine plans

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kayaker43
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Joined: 13 Jun 2007
Posts: 175

PostPosted: Tue Oct 13, 2015 7:32 pm    Post subject: Reply with quote

I use Polyester resin on wood/bondo molds but you can form over bare wood for a few parts. Many paints and varnishes get tacky when hot and you have to put messy mold releases on them. Use Polyester not epoxy resin, one coat to seal with a light sanding to knock off the nubs, then a second coat or more. This puts a hard shell over the wood that doesn't stick.
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Doug Walsh
www.build-stuff.com
Hobby-Vac and Proto-Form machine plans

Also other plans books and videos for people who like to build things
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glenn201
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Joined: 06 Apr 2013
Posts: 18
Location: Brazil IN

PostPosted: Thu Oct 22, 2015 6:07 pm    Post subject: Reply with quote

kayaker43 wrote:
I use Polyester resin on wood/bondo molds but you can form over bare wood for a few parts. Many paints and varnishes get tacky when hot and you have to put messy mold releases on them. Use Polyester not epoxy resin, one coat to seal with a light sanding to knock off the nubs, then a second coat or more. This puts a hard shell over the wood that doesn't stick.

do you have a link where i can by it at an thanks a lot
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kayaker43
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Joined: 13 Jun 2007
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PostPosted: Fri Oct 23, 2015 10:13 am    Post subject: Reply with quote

http://www.westmarine.com/buy/west-marine--polyester-boaters-resin--P004_120_002_501

Its the most common type of resin used on every boat and corvette.
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Doug Walsh
www.build-stuff.com
Hobby-Vac and Proto-Form machine plans

Also other plans books and videos for people who like to build things
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glenn201
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Joined: 06 Apr 2013
Posts: 18
Location: Brazil IN

PostPosted: Fri Oct 23, 2015 7:54 pm    Post subject: Reply with quote

thanks for the help
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