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PostPosted: Wed Mar 21, 2012 5:22 pm 
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Joined: Sat Jul 25, 2009 11:19 pm
Posts: 356
Location: San Diego
Can I use West System 404 High-Density Filler with 3M Resin?

I already mixed it and used it to patch a small hole before I spray some gel coat.
The problem its taking a long time to set, will it set it my real question.
Of course I used hardener and prepped with 80 grit and compressed air.

Please tell me this will work!

JD

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PostPosted: Wed Mar 21, 2012 7:13 pm 
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Joined: Mon Jul 14, 2003 7:11 pm
Posts: 4623
Location: Detroit, MI
The filler shouldn't have any effect on the cure rate of the resin. It's just calcium metasilicate and silicon dioxide - both are realtively inert.

Shine an incandescent lamp on it for a couple of hours, or leave it in the sun.


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PostPosted: Thu Mar 22, 2012 7:35 am 
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Location: San Diego
MBounds wrote:
The filler shouldn't have any effect on the cure rate of the resin. It's just calcium metasilicate and silicon dioxide - both are realtively inert.

Shine an incandescent lamp on it for a couple of hours, or leave it in the sun.



Thanks, after I read your post I relaxed. I was about to scrape it off and sand the rest out and start over. It is just taking a while to set I only added 8 drops of hardener for about 1.5 - 2 oz of resin and enough 404 to turn it into mayonnaise. The resin recommends 10 drops per ounce. I felt it this morning and it had set.

I heard that adding less hardener makes the resin stronger overall even though it takes longer to set? This is not why I added 8 drops, the 8 drops was a goof.

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PostPosted: Thu Mar 22, 2012 9:33 am 
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Joined: Mon May 09, 2005 10:25 am
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Location: Jersey Shore
4 to 6 drops of hardener per oz of resin is probably not enough. I usually use at least 10 to 12 drops per oz...but I'm also not a very patient person.

http://uscomposites.com/pdf/MEKPDirections.pdf

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