Hi Tiag -

What I meant when I meant sticky, was that outdoors, the heat will make it attract pollen, dust, debris. That just the nature of the beast u get with oil jaw dropping looks nuba. The cars do CLEAN better with sealants in general as stuff does not stick to it as much, water sheets off better, contaminates sheet off better, and at the end of the day, with sealants, you have less stuff ontop of it, whether it's before or after a wash...YMMV, as everyone has a different process/regimine, etc.
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Re: sealants // coatings, wet sanding not required. A polish of the affected area would be required, but if you need to deal with that area for whatever the reason may be, it would probably need polishing anyhow.