Bloody Control casings. Newish set of tyres wont stop leaking through them, although after being left in todays sun I may have found another source of leakage.
Despite the seepage the Butcher/Slaughter combo is great.

[url=https://flic.kr/p/VX2QNf]Leaky tyres-3[/url] by John Stanley, on Flickr

[url=https://flic.kr/p/WkHbit]Leaky tyres-7[/url] by John Stanley, on Flickr

Mine sealed eventually.

Mine weep a lot. Bike has been out of use a long time but hopefully will stop eventually

I’ve got the Grid casings. Same problem with the rear tyre. The front is fine though.

Using Stans? My tyres never seem to stop weeping these days (Maxxis, Schwalbe & OnOne tyres) but dont seem to lose air pressure, well not noticeable amounts

You need tubes.

True, but I don’t need punctures or pinch flats.

the other source of leakage being the valve base?

Spesh are a bit weepy, but they go up nice and easy. i just chuck in extra monkey spunk when i set them up

Source of monkey spunk?

Valve base indeed. Left in the sun trap on the veranda. Poor thing.