Regarding the paint..
I used a roller both for the two coats of primer and the two coats of paint (in some places 3 coats of paint).
Breakdown:
- I lightly sanded the bare MDF (For sanding I used a multi-sander, Bosch PSM 160 A)
- Applied 1st coat primer
- Covered screw holes (Plastic Padding PP100)
- Sand everything
- Applied 2nd coat primer
- Sand everything
- Applied 1st coat paint
- Sand everything
- Applied 2nd coat paint
(skip sanding)
- Touch-up 3rd coat
The primer was a "normal" wood primer (oil-based to dig into the mdf).
The black paint was... I'm searching for words.. "cursed magic"!? I got it recommended by my local dealer.
Perhaps you can see this link (
http://www.nordsjo.se/sv/produkter/ambiance-superfinish-40 )
If not, the paint is acrylic latex with added polyurethane if I'm reading the description correctly.
Stirring it reminds me of mercury. Odd!
In places where I really did the sanding correctly the paint would just magically stick and float to perfection.
In places where I rushed priming/sanding or sanding was hard to do the paint was like... painting over silicone!? Done that? It would just not stick. (You can see what I mean in the picture above where the first paint coat has been sanded, the insides are almost bare as I had not spent that much time sanding there)
Please note; I've never done painting like this before so I cannot tell if I any of the steps were unnecessary.
Regarding the 8 buttons..
Simple math: S-F(3+3)+N-G(0+4) = 8
I figured that 7 would look even more wonky than 8 (for anyone not regular to this forum).
I've currently got top right buttons wired to Coin when playing Mame. (Works for me!)
If I ever redo the CP, which I might, I'll go with 4 buttons only as SF is not that important to me.