[Paddlewise] Resin Question

BoB Denton wanted to know the difference between resins as sold for boat
building purposes and 2 part adhesives.

First thing, is the 2 part adhesive an epoxy?  It could be resorcinol, urea
formaldehyde, or some other kind of adhesive.  There are lots that come in 2
components.

If it is an epoxy, and it is sold as a glue, chances are it has some kind of
filler in it to make it thicker, less likely to run or get squeezed out of
the joint.

All sorts of things are used as fillers for adhesives:  wood flour, plastic
or cotton "minifibres", silica powder, metal, etc.  Other fillers are used
to make fairing and filling compounds, where structural adhesion isn't critical.

As purchased for boat building, there are none of these things in the resin.
If you want to make glue out of WEST or System 3 or what-have-you, you have
to buy the filler and mix it in.  Use it plain as a laminating resin, or
with fillers to make adhesives and fairing compounds.

Rob.


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