Best paintable exterior frame sealant?

[Ian]

I've been fixing a leaking Juliet balcony, as the drain holes in the brass base trim were leaking in to the woodwork. I hadn't realised for the 6 years we've been living here, as it's taken this long for it to become visible. I've repaired the rot and prepared everything for painting, however I'm just about to go and fetch some paintable frame sealant to seal up the job.

I was going to just pick this everbuild frame sealant from Toolstation:

Window & Door External Frame Sealant

Get the finish around doors and windows just right with this paintable frame sealant. You can use it indoors and out, and it'll stick to most surfaces including metal and wooden frames. Provided you only use it inside, it will also bond with PVCu. Once it's surface dry (normally within the hour)...

www.toolstation.com

However, I've had problems with cheap acrylic sealants cracking before.

Has anyone got any suggestions for something they can rely on?

 

[Silentrunning]

Ian, I have no idea what is available in the UK but over here we have DuPont 5200 Sealant. This stuff is justwicked strong and absolutely weather proof. It is so strong we use it as an adhesive on boats. You must wear rubber gloves while applying it or you could possibly glue your fingers together. You have to be sure to put it where you want it because once it cures, it is there for good.

 

[Ian]

Thanks @Silentrunning, that looks a little bit like this polyurethane stuff (Puraflex 40) that I've used around our pond:

Puraflex 40 PU Sealant & Adhesive

Noticing cracks or expansion in concrete? Purafelex 40 PU sealant will help you fix it quickly. It's a useful tool to have in any construction site or home, as it bonds to most materials. This product will work on concrete, wood, metal, aluminium, polyester, glass, uPVC, stone and ceramic.Thanks...

www.toolstation.com

It does say that it's overpaintable too, so perhaps I'll give this a go. I've got the black and grey tubes already, so I may as well add the white one for Windows to the collection .