Conathane is a brand name. Apparently it can be a filled polyurethane, an unfilled hard polyurethane, or an epoxy. I did not bother checking on Humiseal. If you want answers about specific substances, please:
1) Don't just give a brand name that could apply to several different products. Be specific.
2) Give a link to the product description
3) Give a link to the product's technical data sheet
4) Give a link to the product's MSDS
It is conceivable that one or both products can dissipate static, but we don't know, as you didn't give enough information to find out. How protective that coating would be is something the manufacturer would have to document. However, if there is a spark from your hand to the PCB, it seems unlikely the coating will be very protective.
Acetone is a fairly aggressive solvent. It can dissolve some coatings, e.g., lacquers, and it can denature other coatings and make them easily scraped off, e.g., many enamel paints. Most polyurethanes and epoxies will be fairly resistant to it. In fact, as a general rule, such polymers are quite resistant to all solvents after they polymerize (i.e., get hard). Those solvents that do affect such polymers do so by denaturing them, rather than dissolving them.
As for components on your board, acetone may affect polystyrene and acrylic types of plastics, but nylon, epoxy, acetal, and polypropylene are generally resistant. Teflon and related plastics are resistant. Acetone may affect the labels on some components. I would be very careful using acetone around any optical component, such as an IR emitter or detector. You fail to tell us what the pcb you are using is made of. Teflon is resistant to acetone. Epoxy, as already stated, is also fairly resistant. One thing to be careful of is the longterm effect of acetone on some plastics. There may be no immediate effect, but months after exposure the plastic may start to crack and craze. Every plastics manufacturer will have a chart of chemical resistance, and acetone is usually shown on those charts.
John