WELDBOND® MAY BE A WONDER GLUE, BUT NOTHING IS PERFECT.
Plastics, rubber and cast metals will not produce a bond with Weldbond®, i.e. Polyethylene, unbacked vinyl, P.V.C, Teflon®, polypropylene, vinyl to vinyl, cast iron, cast aluminum. Weldbond® is not intended for marine applications. It is not recommended for use on exposed exterior surfaces. Weldbond® is only recommended for use on outdoor surfaces if the glued joint is protected with outdoor sealant or paint. Recommend for use as a porous surface sealer on interior surfaces only (such as interior garage or basement floors). See instructions here on this website. Weldbond® is not recommended for use in the construction of laminated structural beams.