Loss of tyre pressure

[redfox1]

Are you sure its sealant and not just remains of  whatever stuff they used to help tyre slip onto rim?
Where I get my bike  tyres fitted he uses a soaplike lube to ease them on better and it leaves a white residue.

Yea,that's right,the residue is white-does anybody know what colour the sealant is?-Problem is,this tyre fitter comes highly recommended round here and is normally quite trustworthy-but something's not quite right!