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WEST System 403 Microfibers Adhesive Filler
$13.75In Stock
West System 403 Microfibers Adhesive Filler
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WEST System 403 Microfibers Adhesive Filler Customer Questions and Answers

3 of 3 Questions

Question

I bought the WEST 105 and 206 hardener. Need to make a "Peanut Butter" sauce to bond my new plywood floor to the side hull. What third agent should I buy? So many to choose from WEST! Please help!

Asked on 04/10/2013 by Undisclosed

Top Answer

I have used both 403 and 406 fillers and personally prefer the 406 colloidal silica for making smooth peanut butter. It is easy to mix and work. The only qualifier is that the finished surface is harder to sand than micofibers, but this may not be an issue in your case. Without knowing whether the joint is exposed and what potential flexing there might be it is hard to advise on the detail. 406 and west epoxy will likely be stronger than whatever they are connecting to. Good luck!

Answered on 04/11/2013 by BRIAN CRAIG
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Answer

I used 403 filler for general thickening. If The epoxy was going to show like on an edge and a didn't w abt to sand (i don't like sanding) and wanted a very "fine" rdge, I used 404 filler.

Answered on 04/11/2013 by MIKE BOSTIC

Answer

I actually prefer 406 for this purpose. 403 will work, but tends not to give as smooth a fillet as 403. You really need to use a lot of either additive, especially 406, to prevent sag. The other option, although much more expensive, is to use West's Six10. This is premixed, and because you are using a caulk gun, it lays on a fillet very smoothly and evenly. The price is much, much more than mixing your own, however.

Answered on 04/12/2013 by JEFF HUFFENBERGER

Answer

406 colidial silica and 403 micro fibers mixed together. It will be strong and spread smooth. 403 by itself clumps.

Answered on 04/12/2013 by KEN LEDONNE

Answer

The 403 filler is good for that. Essentially hardened resin is very brittle. Adding a fiber acts to stop if cracking. So a microfiber filler is used when strength is needed. Microbaloons are used when no strength is needed, such a fairing or fillers. Reading Gougeons Bros book on the subject would be well worth it if this a large project.

Answered on 04/13/2013 by CHARLES ROSS
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Question

Which has a smaller grain size 403 or 406? Which gives stronger bond 403 or 406?

Asked on 11/29/2014 by Sylvia Maassen

Top Answer

Not owning a microscope I can't literally answer about grain size. Colloidal Silica (406) has a finer texture out of the container and blends easily to form a smooth adhesive whose thickness is easily controlled. 403 seems easier to sand once hardened. The West System chart shows 403 better for laminating and 406 better for fillet bonds. It also shows 406 as higher strength. While I have both, I have primarily used 406 for years for bonding.

Answered on 11/29/2014 by BRIAN CRAIG
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Answer

Just saw this query today, so you probably have already had a lot of responses... Bottom line:406 is super-fine and is valued for it's smoothing and thixotropic qualities. Used extensively in producing smooth fillets under epoxy-glass construction. Will sand smooth without much fuss. 403 is stronger in face-to-face bonding, where I much prefer to use it, but that is the only place I use it over 406 because it is much, much more difficulty to sand smooth than the 406.

Answered on 12/01/2014 by SHAUN BOARDMAN
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Question

I want to fill the depressed areas in a fiberglass raised panel door to create a level surface to bond a new laminate color sheet. Depth of depressions is 1/4" x 1 1/2" wide. Will the West epoxy with high strength filler be suitable for placement in full depth at once?

Asked on 05/22/2017 by Dom from Concord, Ma

Top Answer

Yes, you can fill with thickened epoxy with 403 filler.

Answered on 05/24/2017 by JD Tech Team
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