Tamiya extra thin cement is much less adhesive than Mr Cement
SP, so you will need to use more glue and the bond wont be as strong. Also makes a bit more mess than
SP
Back when I still used Tamiya glues, I basically had to use two, the regular cement and extra thin. I'd use the regular for larger joins, and extra thin cement for the smaller bits. With
SP cement, I can just use it for EVERYTHING
On the upside, Tamiya extra thin doesn't smell as funky as the
SP