There is an article from Fine Woodworking magazine that reviewed a
new ‘outdoor’ product
http://www.taunton.com/finewoodworking/pages/w00144.asp
with a mfgr’s. link at
http://www.loctiteproducts.com
or Adhesive - E6000 has worked for me more often than not. Find out
more at
http://eclecticproducts.com/e6000/home.asp
In the same periodical; a download file on wood ‘edge treatments’
for an enamel
http://www.taunton.com/finewoodworking/pdf/EdgeTreatments.pdf
Lastly, use of a ‘french cleat’ on the back of a heavy mounted
enamel plaque will support an almost unlimited weight. The blueprint
of a wooden ‘french cleat’ can be found at this link
http://benchmark.20m.com/plans/FrenchCleat.pdf
or there are some metal ones using the same principle
http://www.panelclip.com/panel.htm
Regards,
Mark