What I've done it turn the can upside down, then drill into the side with a pin vise close to the bottom. Then I can pour the paint into an airbrush bottle. Then I seal the hole with a piece of tape over it.
It's an Airfix kit. It builds pretty nice. I used a little scrap CF decal on the rear fender. The images on the screen are larger than the actual model unless your using a smart phone to look at them.
The box art:
The model:
And alongside 1/24 scale cars:
I mostly use Testors enamel. I have used Tamiya laquers a couple of times. My current project will use it because they have the correct Ferrari Red I need for it.
Here's a review I found of the kit with the box opened up: http://www.modeltruckbuilder.com/index.php?/forums/topic/73-ertl-international-transtar-ii-eagle-6183/
I built this in 2000. I made the base with a 2 lb tub of spackle. I wrapped masking tape around it and textured it as it was skinning up. I rolled the chassis over it to make tire prints. The puddle is Future. I just figured it out as I went along. It was also the first time I dirtied up a vehicle. It appeared in Scale Auto from contest coverage of the ACME Southern Nationals. It was my first model to appear in Scale Auto too.