I used Autopaint rubberised brushable seam sealer tim! For the wing to slam panel you can buy it in a 'mastic style' cartridge for the mastic gun, but i used brushable again but masked up to get it straight...same job!

Basically its all in the prep really. Gunning the paint on is the easy bit. As long as its mixed ok and you have a half decent gun youll be ok. I used base coat laquer, and tack clothed between every coat of base before laquering as the garage is not totally dust free, i also dampened the floor. The pics DONT do it justice, you can do your hair in it