Help on Paint job

[Darkness]

Hi there all...was painting my rear drums and given my low skill level there appears to be a 5cm (radius) round patch of "bubble" . Any way to get rid of it and respray?

 

Was thinking of sanding down the whole drum with coarse sand paper then use fine sandpaper b4 respray...will that work?

 

advice pls. thanks.

 

btw after spray it sure looks much better than without spray

 

thanks

Cheers

Darkness