Need DIY Painting Advice

[Rashy]

So i recently rummaged through my attic and found a longboard (skateboard but longer, afaik its used for downhill runs but idk) and i want to paint it. So i removed the wheels and started washing the whole board. Of course i had to get the neon green wood paint off so i had a clean wood to paint on, so i sanded it. Mistake? Probably. The Sandpaper i used was Alumunium Oxide AA320, a little too smooth for sanding out paint. 1 Meter and 1 Hour passed since i began sanding it off. I ran out of sand paper. Theres a paint store near my house that i can walk to tomorrow noon but my question is:

 

Do i keep sanding it with a rougher sandpaper

OR

Do i use paint thinner

 

Because the paint seemed thick and i thought sanding would be a longer process but refined. I want a clean wood in the end. My plan is to paint The Great Wave off Kanagawa on the bottom of the board, using acrylic paint.

[Mushious]

Paint thinner is for diluting paint before use. What you want is paint stripper. I'd recommend trying a coarser grain of sandpaper before pulling out the chemicals. p120 should get it off pretty quick. Change up to something like p400 or p800 even to get a good finish ready for painting.

[Rashy]

Paint thinner is for diluting paint before use. What you want is paint stripper. I'd recommend trying a coarser grain of sandpaper before pulling out the chemicals. p120 should get it off pretty quick. Change up to something like p400 or p800 even to get a good finish ready for painting.

ill look into that tomorrow. thx