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f1boss(at)gmail.com
Guest

Posted: Sun Jun 08, 2008 7:13 am Post subject: pinholes

From: tom sargent <sarg314(at)comcast.net (sarg314(at)comcast.net)>

Subject: UV SmoothPrime progress

I recently posted about having very spotty results with UV smooth prime.

  My trouble is that it usually dries with so much texture and tiny

bubbles that I have to sand it all off to eliminate the texture, and I'm

back where I started.  I have read the instructions on the can, read the

 polyfiber web page and talked to their technical help (all of which is

necessary since they don't list all the information in one place!).

 Hi fellas:

 We use a different procedure -- developed over years of fighting this dang pinhole issue.

 1: clean the part thoroughly; let dry

 2: dry sand with 150 grit

 3: wipe off dust with dry paper towel

 Yes, you read it correctly. Leave the dust in the pinholes!

 4: Spray with PPG DP-(XX)LF primer (we use the grey, generally); let dry

 5: Fill any remaining pinholes with PPG sanding primer, P/N K38, applied non-reduced with a plastic bondo squeegee. Sand with 220. Wet sand is OK.

 The DP-LF primer is very hard, and the K38 is very soft. it is a slightly different grey, but applying over white might be a better idea so you can see what is happening. You may need to apply the K38 several times, depending on your talent with a bondo squeegee.

 6: second coat of primer; let dry; final paint.

 This process will probably work with any urethane or epoxy primer, and any soft sanding primer, tho we use the PPG stuff. Remember that you are actually filling the holes with sanding dust, so don't be too agressive wiping the parts off!

 We also use the K38 along the rivet lines to reduce the ring around the rivet heads. Squeegee and sand as with the composite parts.

 Carry on!

-- 

Cheers!

Mark Frederick

Team Rocket LP

www.teamrocketaircraft.com

  [quote][b]

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sarg314(at)comcast.net
Guest

Posted: Sun Jun 08, 2008 10:10 am Post subject: pinholes

Mark:

	I've noticed that if you just wipe off the dust, it fills the pin 

holes.  Great idea.



	Another radical approach I just heard of from a Vari-Eze builder that I 

work with is to sand the fiberglass with pretty coarse sand paper - 36 

grit if you can believe it - and then just squeegee on pure epoxy.  Then 

light sand and repeat as necessary.  They claim that 1 to 5 coats of 

epoxy is all you need to get a perfect surface.  No filler at all.



	Loehle Aircraft also has a radically new system that sounds good.  If I 

ever have to do this again I will definitely do something very different.



	I can't escape the sinking feeling that if I just knew what I was 

doing, this whole fiberglass extravaganza would have been 10 times easier.

Mark Frederick wrote:

 	  Quote: 	
		   Hi fellas:

  

 We use a different procedure -- developed over years of fighting this 

 dang pinhole issue.

  

 1: clean the part thoroughly; let dry

 2: dry sand with 150 grit

 3: wipe off dust with dry paper towel

  

 Yes, you read it correctly. Leave the dust in the pinholes!


	


--

Tom Sargent, RV-6A

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rocketbob(at)gmail.com
Guest

Posted: Sun Jun 08, 2008 2:14 pm Post subject: pinholes

Guys, I have a friend who trains new employees at Scaled Composites, and this is what they do.  The technique they use to fill pinholes is called a "resin wipe".  It goes like this: sand with 36 grit paper. Squeegee pure epoxy on then immediately squeegee it off.  Repeat 3-5 times, right after the epoxy gets tacky from the previous coat.  Wet sand with 150-220 grit.  Then spray DP-48 followed by a guide coat of something darker, and simply sand the darker color off.

 

Regards,

Bob Japundza

RV-6 flying F1 under const.



On Sun, Jun 8, 2008 at 2:07 PM, tom sargent <sarg314(at)comcast.net (sarg314(at)comcast.net)> wrote:

[quote] --> RV-List message posted by: tom sargent <sarg314(at)comcast.net (sarg314(at)comcast.net)>

 

 Mark:

         I've noticed that if you just wipe off the dust, it fills the pin holes.  Great idea.

 

         Another radical approach I just heard of from a Vari-Eze builder that I work with is to sand the fiberglass with pretty coarse sand paper - 36 grit if you can believe it - and then just squeegee on pure epoxy.  Then light sand and repeat as necessary.  They claim that 1 to 5 coats of epoxy is all you need to get a perfect surface.  No filler at all.

  

         Loehle Aircraft also has a radically new system that sounds good.  If I ever have to do this again I will definitely do something very different.

 

         I can't escape the sinking feeling that if I just knew what I was doing, this whole fiberglass extravaganza would have been 10 times easier.

 

 

 Mark Frederick wrote:

  	  Quote: 	
		   Hi fellas:

  We use a different procedure -- developed over years of fighting this dang pinhole issue.

  1: clean the part thoroughly; let dry

 2: dry sand with 150 grit

 3: wipe off dust with dry paper towel

  Yes, you read it correctly. Leave the dust in the pinholes!

 	
 



 --

 Tom Sargent, RV-6A



 

 

 

 

 



[b]

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panamared5(at)brier.net
Guest

Posted: Mon Jun 09, 2008 5:34 am Post subject: pinholes

At 01:07 PM 6/8/08, you wrote:

 	  Quote: 	
		    I can't escape the sinking feeling that if I just knew what I was 

 doing, this whole fiberglass extravaganza would have been 10 times easier.


	


Ah So, the mystery of life.  As my old Uncle used to say, most things 

are pretty simple, once you learn how.  Unfortunately by the time you 

learn "how" the project is over.



Bob

RV6 "Wicked Witch of the West"

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JohnInReno

Joined: 08 Sep 2007
Posts: 150

Posted: Tue Jun 10, 2008 11:43 am Post subject: pinholes

What is DP-48?

 

 John Morgensen

 

 Bob J. wrote: [quote]Guys, I have a friend who trains new employees at Scaled Composites, and this is what they do.  The technique they use to fill pinholes is called a "resin wipe".  It goes like this: sand with 36 grit paper. Squeegee pure epoxy on then immediately squeegee it off.  Repeat 3-5 times, right after the epoxy gets tacky from the previous coat.  Wet sand with 150-220 grit.  Then spray DP-48 followed by a guide coat of something darker, and simply sand the darker color off.

   

 Regards,

 Bob Japundza

 RV-6 flying F1 under const.

   

   On Sun, Jun 8, 2008 at 2:07 PM, tom sargent <sarg314(at)comcast.net (sarg314(at)comcast.net)> wrote:

    	  Quote: 	
		  --> RV-List message posted by: tom sargent <sarg314(at)comcast.net (sarg314(at)comcast.net)>

     

 Mark:

        I've noticed that if you just wipe off the dust, it fills the pin holes.  Great idea.

     

        Another radical approach I just heard of from a Vari-Eze builder that I work with is to sand the fiberglass with pretty coarse sand paper - 36 grit if you can believe it - and then just squeegee on pure epoxy.  Then light sand and repeat as necessary.  They claim that 1 to 5 coats of epoxy is all you need to get a perfect surface.  No filler at all.

     

        Loehle Aircraft also has a radically new system that sounds good.  If I ever have to do this again I will definitely do something very different.

     

        I can't escape the sinking feeling that if I just knew what I was doing, this whole fiberglass extravaganza would have been 10 times easier.     

     

     

 Mark Frederick wrote:

      	  Quote: 	
		   Hi fellas:

  We use a different procedure -- developed over years of fighting this dang pinhole issue.

  1: clean the part thoroughly; let dry

 2: dry sand with 150 grit

 3: wipe off dust with dry paper towel

  Yes, you read it correctly. Leave the dust in the pinholes!

     	
     

     

     --

 Tom Sargent, RV-6A          

     

     

     

     

     

     

   



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 [b]

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_________________
John Morgensen
RV-9A - Born on July 3, 2013
RV4 - for sale

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