Does anyone have tips on how to get off that green-black gunk that start to grow on that very chair model after if has seen couple of summers and sun has made it’s surface coarse and it’s shedding microplastics like no tomorrow.
Yes, oven cleaner with lye. Don’t know if it actually works, just assuming it’s mold and that lye will kill the mold. Also assuming it shouldn’t melt the plastic, though it technically could I guess in some freak accident.
The plastic in these chairs is very porous and a great place for bacteria and other stuff to hang out.
edit: also don’t trust lemmy shitpost. There’s probably a professor in chair cleaning out there.
They are talking about that weird chalky plastic oxidation and sun damage. As far as I know you have to strip a layer off one way or another to remove it.
I thought the green-black was mold, but it may just as well be some kind of oxidation I guess. Though if that’s the case then maybe lye will melt it down anyway lmao
Probably best option is to sand it, prime it, and repaint it. Use a UV resistant paint made for plastic or UV resistant top coat, and should be good for several more years.
The green black gunk is probably algae, maybe with mildew (guessing you live somewhere that gets humid, or at least takes a while to dry from dew) so feel free to wipe it down with bleach or a fungicide after sanding but before you paint it.
In that case, I’d recommend the sanding, then a wipe down with bleach for the algae, then primer impregnated with a fungicide like Zinsser mold blocking primer (just an epa-approved example, but decent place to start). It’ll form a barrier between the raw degraded plastic and the paint (so anything existing won’t continue to grow), as well as helping prevent molds from growing in the new paint layers.
Just wait for a really dry day to do it (much as you can, you know, or if you have a garage you can run a dehumidifier in that may work too), and let the paint dry for a long time between coats to prevent any moisture trapping.
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