Here's a picture of my bonnet with flow coat on, took all of 10 minutes. Another coat will smooth it out even more, I'm not giving it another coat yet as I'm still not sure on the final colour.
There is a great video on youtube showing a mould being taken of an MG Midget front end, shows strengthen ribs being moulded, well worth watching.
https://www.youtube.com/watch?v=GXzR17LktSg