all silica is not created equal

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jprice
Posts: 687
Joined: Sun Aug 28, 2011 11:59 am
Location: Marietta, GA

all silica is not created equal

Post by jprice » Wed Jan 29, 2014 1:20 pm

So I finally ran out of the silica filler that came with my initial glen-l epoxy kit.
I got on the glen-l store, and saw that they have a #2 silica that's 1/3 the price of the #1 silica.
I'm thinking "silica is silica...".
Oh no! The number 2 stuff is a powder, as opposed to the tiny microfibers that make up the #1 filler. The problem with it is it takes A LOT of this silica to thicken epoxy to the point where it doesn't sag or run. I mean a ridiculous amount. You really have to thicken it to the point where it's almost dry, which makes it a little difficult to work. Unlike the #1 stuff which gives you a light fluffy thickened epoxy, that stays where you put it.

Lesson learned... don't go for second place. :wink:

Trackhappy
Posts: 1412
Joined: Wed Feb 17, 2010 5:42 pm
Location: Sunshine Coast, Queensland, Australia. Building Gentry.

Re: all silica is not created equal

Post by Trackhappy » Wed Jan 29, 2014 3:48 pm

I don't think it is a quality thing, rather they are for different purposes. I imagine that the powder is used for fine fairing work and the fibrous type is more a glue thickener. Maybe the description needs making a little clearer for potential buyers...
By the time I have built a boat, I'll be ready to build a boat....

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