Skin is not applied to RadLabel, when i am using Sass Theme Builder for Bootstrap.
Even if I select all the controls, there is no css file in the downloaded archive that would contain the class name .RadLabel
Thank you for your feature request.
While the Label has a pretty simple rendering and its appearance can be easily customized, it is a good idea to be added to the theme builder for completeness of the application.
Until than, you can easily style the component using the technique shown in this blog post:
and for example by overriding the following class:
border: 1px solid red;