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Cab o Sil substitute

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msausen

Joined: 25 Oct 2007
Posts: 559
Location: Appleton, WI USA

Posted: Tue Oct 14, 2008 4:54 am Post subject: Cab o Sil substitute

Can you substitute WEST System 406 Colloidal Silica for cabosil?  I don't know of any big differences but figured I would check with some of our glass gurus just to be safe.  Gary, Deems, Dave?



Michael

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Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Tue Oct 14, 2008 7:33 am Post subject: Cab o Sil substitute

I used the West System colodial silica. Its purpose as I understand it 

is to prevent/reduce the epoxies properties to 'bleed', so that the 

epoxy doesn't leech out of the joint while curing.



Deems



RV Builder (Michael Sausen) wrote:

 	  Quote: 	
		   



   Can you substitute WEST System 406 Colloidal Silica for cabosil?  I don't know of any big differences but figured I would check with some of our glass gurus just to be safe.  Gary, Deems, Dave?



 Michael

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John Ackerman

Joined: 19 Jun 2006
Posts: 130
Location: Prescott, AZ

Posted: Wed Oct 15, 2008 7:37 am Post subject: Cab o Sil substitute

FWIW I have used them interchangeably, and I'd guess that they are  

from the same bin- but that's a guess only.

Added to flox or glass microfiber mixtures, they make it easier to get  

a smoother surface and nicer flow when applying, thus less sanding  

next day.

Disclaimer: I'm no fiberglass expert by a very long shot.

John Ackerman

On Oct 14, 2008, at 8:33 AM, Deems Davis wrote:

 	  Quote: 	

 I used the West System colodial silica. Its purpose as I understand  

 it is to prevent/reduce the epoxies properties to 'bleed', so that  

 the epoxy doesn't leech out of the joint while curing.

 Deems

 RV Builder (Michael Sausen) wrote:

> 

> >

>

>  Can you substitute WEST System 406 Colloidal Silica for cabosil?   

> I don't know of any big differences but figured I would check with  

> some of our glass gurus just to be safe.  Gary, Deems, Dave?

>

> Michael

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Andy Turner

Joined: 10 Jan 2006
Posts: 31
Location: Clarion, PA

Posted: Wed Oct 15, 2008 1:58 pm Post subject: Re: Cab o Sil substitute

Another alternative - this cellulose based structural filler is new on the market, promises to be easier on tools and our lungs. 



http://www.westmarine.com/webapp/wcs/stores/servlet/producte/10001/-1/10001/350113?&cid=chanintel&ci_src=14110944&ci_sku=350113



When we find our glass expert I would like to learn about any tradeoffs associated with this product.

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_________________
Andy Turner

speckter(at)comcast.net
Guest

Posted: Thu Oct 16, 2008 5:01 am Post subject: Cab o Sil substitute

Here is a little primer for those still unsure exactly what product to use

when.



Straight epoxy is used to lay up fiberglass cloth.  This should be done

without additives like those listed below. 



Cabosil is used to stop slumping and running of the epoxy.  It does not

weaken the epoxy like micro Balloons does.



Chopped fibers (chopped fiberglass), Flox (chopped cotton)are used like

re-bar to give additional strength to the mix.  The down side is that it

makes the cured resin a bugger to sand and does not usually give a very

smooth surface.



Micro or Micro Balloons are small spheres used to extend the resin to make

it easier to sand and have less weight than pure epoxy.  However the

strength of the mix is weaker.  The more balloons you add the weaker the mix

is.



The trick is to analyze your need and then mix up the appropriate material

for use.



Hopefully this helps a little for those who are just getting there feet wet

with this medium.



Gary Specketer

Dragonfly, Glasair III, Glastar, RV10, Tech counselor



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