Durable, weatherproof adhesive for sticking UPVC board, back-to-back?

[wasaol]

Hi all,

I need to stick two long lengths of 10mmx100mm general-purpose UPVC board back to back. This will be an exterior job and needs to last.

I have several surplus tubes of exterior frame sealant, which I think is probably acrylic. Another option might be silicone sealant. Yet another option might be expanding polyurethane foam.

Will the frame sealant be an adequate option? I want the bond to last around 30 years or so.

Many thanks, JD

[spuorgelgoog]

Owain

[tabbypurr]

Acrylic doesn't last long if it stays wet. PU doesn't either, it needs to dry out fully frequently, and between 2 plastic sheets it won't. Silicone's fully water tolerant, but lacks strength in shear.

We just had a thread on gluing pvc.

NT

[Andy Burns]

This stuff welds PVC, I've only used it on small parts, but seems OK ...

[wasaol]

It looks worth a punt. Thank you - and thanks to the other respondees. JD

[Andy Burns]

n.b. It's cheaper elsewhere

[newshound]

Confusing advert, is that perhaps for four tubes? In which case the price looks OK.