I like AeroPoxy. It does a great job in all facets of application. The Structural Aeropoxy is tough to stir but is very strong also.I am at the proof of concept modeling phase of my project, and on our model, we have exclusively used EcoPoxy products with excellent results, to include filling & finishing on evaluation layups. It seems to be compatible with a prepared surface that was laminated with AeroPoxy products, so I can't vouch for compatibility with West.
The matrix is very easy to work with, has very little smell and is completely non-toxic. It can fully cure in temps as low as 55 degrees F, but I have not personally tried this; we do operations with the shop at around 70F.
Despite great results in load beam testing and such, we plan to use AeroPoxy on our full scale build, as the EcoPoxy folks are unwilling/unable to share mechanical properties data with us in order to validate our findings.
That being said, perhaps EcoPoxy is worth a shot for you. Best of luck!!