And, be aware that, if the scope is not pointed directly towards the Sun, the focussed light does not come out of the focusser, but is focussed elsewhere. I recently saw a photograph (Cloudy Nights?) where someone left their truss dob vaguely pointing towards the Sun for a few hours. There was a burnt line across everything at the top of the scope.
I'll see if I can find it.
Edit:- Not what I wanted, but I found this:-
http://thehowzone.com/how/Sun_Photos I have a cap that I had over my focusser that looks like this. When your primary mirror has condensation over it in the morning, it is tempting to point the scope towards the Sun to encourage the condensation to rapidly lift. Don't do it!