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Mold release ????

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Rick Lewis

Joined: 03 Jul 2007
Posts: 122
Location: Kingston, Tn.

Posted: Wed Dec 09, 2009 4:17 pm Post subject: Mold release ????

I need help from someone in the know about what I should use for mold release.  I have attached a picture of the cowling I'm building and want to be sure the fiberglass layup will release from the plug in picture.  I have tried, on a test piece, some mold release agent but it doesn't seem to work.  I have laid up another practice piece, this time using some car wax on the part. Will see how it does tomarrow morning.  



     The cowling plug shown is carved foam covered with bondo to give it a hard shell.  The final covering is two coats of sandable primer.  I sure want to make sure the fiberglass with pop loose from the mold after cure.



Rick Lewis



(VW Water cooled)

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herbgh(at)nctc.com
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Posted: Wed Dec 09, 2009 4:42 pm Post subject: Mold release ????

They call it mold release wax as I recall..Boat builders,,,Aircraft 

spruce etc...  It may be that the heat of curing will overcome some 

other types of waxes..?



   Have helped on many fiberglass layups...nuff to know not to wear 

good clothes or shoes...  Herb

At 06:17 PM 12/9/2009, you wrote:

 	  Quote: 	
		  



I need help from someone in the know about what I should use for 

mold release.  I have attached a picture of the cowling I'm building 

and want to be sure the fiberglass layup will release from the plug 

in picture.  I have tried, on a test piece, some mold release agent 

but it doesn't seem to work.  I have laid up another practice piece, 

this time using some car wax on the part. Will see how it does 

tomarrow morning.



      The cowling plug shown is carved foam covered with bondo to 

 give it a hard shell.  The final covering is two coats of sandable 

 primer.  I sure want to make sure the fiberglass with pop loose 

 from the mold after cure.



Rick Lewis



(VW Water cooled)





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p 76908#276908





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Checked by AVG - www.avg.com

12/09/09 19:41:00

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mdnanwelch7(at)hotmail.co
Guest

Posted: Wed Dec 09, 2009 4:54 pm Post subject: Mold release ????

Rick C

  

   Once you've got your plug finished C the first coating should be PVA mold release.  Next C you'll want to apply a few layers of carnuba wax C or even better C mold release wax purchased for exactly that purpose (which is carnuba wax).

   Between the layers of wax C let them dry properly C then buff them out shiny C just like it was your car.  After you've got about three layers of a good wax base C apply your gelcoat.

  

   I've got a link for you.  Want to learn EVERYTHING you always wanted to know about how to fiberglass properly???  Check out this guy.  His name is Gerald C and is an overall nice guy C and very helpful.  His company makes dozens and dozens of the kind of products you'd need to be a fiberglassing expert.

  

   Here is an eBay ad of one of his products.  This eBay ad will leads you to DOZENS of "how to" videos from him.

  

   BTW C his gelcoat product is especially good.  It can be applied with a high quality foam roller C for a top coat type of use.

  

   In my opinion C Gerald is the guy for all your fiberglassing applications.  Here a link to just one of his products.  It can lead you to the rest of them...and the videos.

  

 http://cgi.ebay.com/EPOXY-RESIN-CRYSTAL-CLEAR-GREAT-4-CARBON-FIBER-24-OZ-HP_W0QQitemZ310163103887QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item483729608f

  

 Mike Welch

 MkIII CX

 

 	  Quote: 	
		   Subject: Mold release ????

 From: cktman(at)hughes.net

 Date: Wed C 9 Dec 2009 16:17:09 -0800

 To: kolb-list(at)matronics.com

 

 --> Kolb-List message posted by: "Rick Lewis" <cktman(at)hughes.net>

 

 I need help from someone in the know about what I should use for mold release. I have attached a picture of the cowling I'm building and want to be sure the fiberglass layup will release from the plug in picture. I have tried C on a test piece C some mold release agent but it doesn't seem to work. I have laid up another practice piece C this time using some car wax on the part. Will see how it does tomarrow morning. 

 

 The cowling plug shown is carved foam covered with bondo to give it a hard shell. The final covering is two coats of sandable primer. I sure want to make sure the fiberglass with pop loose from the mold after cure.

 

 Rick Lewis

 

 (VW Water cooled)

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=276908#276908

 

 

 

 

 Attachments: 

 

 http://forums.matronics.com//files/17_689.jpg

&g========================
	


[quote] 

 

 

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Rick Lewis

Joined: 03 Jul 2007
Posts: 122
Location: Kingston, Tn.

Posted: Wed Dec 09, 2009 5:22 pm Post subject: Re: Mold release ????

What I have tested with so far is PVA mold release.  The directions say to spray it on in several layers but since my test part is small I just brushed it on, two layers.  Maybe I should try it again by spraying on as directed is several layers.  I would seem if you had enough layers of this mold release on that the fiberglass would easily come off.  I will look at Aircraft Spruce and see what they have.



Thanks  



Rick Lewis

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mdnanwelch7(at)hotmail.co
Guest

Posted: Wed Dec 09, 2009 6:32 pm Post subject: Mold release ????

Rick C

  

   The PVA's primary mission is to protect the mother mold from being affected by your layup.  The wax is to allow for easy part removal.

  

   The PVA is very water soluble.  Once you've removed the finished part C you wash the mother mold with water C in order to get back to the pristine surface.

  

   PVA is NOT meant to act as a part release.  Wax is.

  

 Mike Welch

 

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Rick Lewis

Joined: 03 Jul 2007
Posts: 122
Location: Kingston, Tn.

Posted: Wed Dec 09, 2009 6:46 pm Post subject: Re: Mold release ????

Thanks Mike, that makes sense.  I have three gallons of PVA release agent.  That should be enough to last me a lifetime.  I just ordered the release wax from Aircraft Spruce.  I will do another test on all this when I receive the wax. 



Rick Lewis

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Dennis.Kirby(at)kirtland.
Guest

Posted: Thu Dec 10, 2009 7:06 am Post subject: Mold release ????

<<  The cowling plug shown is carved foam >>  

   

Hey, Rick –  

   

What a beautiful shaped cowling (plug)!  

   

Once you’ve finished making the cowling, I bet that there are some on this Kolb List who are willing to purchase additional copies from you, if you are inclined to make more.    

As I have zero experience in working with composites/fiberglass, I, for one, would be happy to pay you a fair price for such a nice-looking after-market Kolb engine cowl!  

   

I think someone on this List made this same comment (offer) to Uncle Craig, when he created a custom cowling for his handsome Arizona-motif Mark-III Xtra, but I don’t know if he’s made any more than just the one cowling for his own Kolb.  (Are you considering making more, Craig?)  

   

Keep up the good work, and please keep us informed of your progress.  

   

Dennis Kirby  

Mark-3, 912ul, Powerfin-72  

Sandia Park, NM  

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Rick Lewis

Joined: 03 Jul 2007
Posts: 122
Location: Kingston, Tn.

Posted: Thu Dec 10, 2009 2:22 pm Post subject: Re: Mold release ????

Thanks for the kind words Dennis on my cowling, it's really has been quite a project so far.  It's very time consuming but fun.  I will have a good usable mold left for future cowling's but unfortunately this is custom made for this engine only.  It is doubtful it could even be adapted for other VW base engine installs.  The reason is my cooling system is going to be different.  The water cooled heads radiators will be located down below the rear of the fiberglass seat area.  There will be a air intake scoop located there to bring in cooling air and exit out the back along side the boom tube.  Easy cabin heat.  That leaves the simple cooling of the cylinder fins that will be taken care of with two naca scoops on the top front area of the cowling.  The size of the two naca scoops will start off with a guess therefore the temps will have to monitored closely.  I will have thermocouples on each cylinder to watch things.  A lot of the cylinder heat will be taken off with the water cooled heads and engine oil.  I have been talking to Steve Bennett, of Great Planes, and he is mostly in agreement with me that this should work.  I should have head temps around 180 to 200 degrees F and would like to keep the cylinders no higher than 250.  This shouldn't be a problem since most of the heat is generated in the heads not the cylinder barrels.



Rick Lewis

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Fred Kerfoot

Joined: 11 Jan 2006
Posts: 14
Location: Tampa, FL

Posted: Fri Dec 11, 2009 9:30 am Post subject: Mold release ????

 

 > Subject: Mold release ????



 Rick.

    Check out Fiberglass Coatings Inc.  www.fgci.com  They have a how to section on their web site.  They supply a lot of the boat builders in the Tampa Bay area.

 I have used their procedures and products on a Velocity project with good results. Just be sure your plug is shiny-smooth and sealed before you start on mold and you should do OK.

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