The painters use 2 iron and 3 wool each. Since pain rollers in real life can usually be cleaned and reused for different projects a few times (or at a minimum replace only the roller)... I'd like to suggest that:
Paint Rollers wear out as usual, but instead of losing them when they run out, only loose the roller. Then you can just put the handle with 3 more wool to recharge it, and of course dye it...
Handle can just be a "iron stick"
Only suggesting this because 2 full pieces of iron to make a handle for the painter for it's limited # of uses seems a bit much to me. Specially when it's the roller and pain (dye) that runs out, not the handle wearing out.