Best sealant for plastic?

[Chud]

Sorry folks - yet another question!

We got a plastic play house for my son the other week but the design is such that the roof leaks in heavy rain as we found yesterday.

http://www.toysrus.co.uk/toys/smoby-my-house-2016/TRUP181200001

However if I can find a suitable sealant it shouldn't be too hard to cut down on the water ingress, at least from the roof as it's currently getting in at the ridge and in the valleys.

I know from building aquariums and stuff that normal silicone isn't good at sticking to plastics - can anyone suggest something suitable - I was thinking Dow Corning 799 Glazing silicone might do the trick?

Cheers!

 

[Burnerman]

Surely a sealant suitable for uPVC windows would serve you well?
John

 

[Chud]

Surely a sealant suitable for uPVC windows would serve you well?
John

That's what I'm hoping - it's why I picked out Dow Corning 799:
"Dow Corning 799 is a one part, plastic and glass silicone sealant for use in glazing and curtain walling applications. It has excellent adhesion to most plastics including PVC-U, and polycarbonate profiles and panels."

Just wondered if anyone had any personal experience.

 

[Burnerman]

That should suit you just fine - DC products are market leaders. High modulus means that it should be able to move a bit too.
John