How can I make a mirror anti-fog permanently?

I think even permanent antibody treatments applied at the manufacturing stage only last about a year or so before they’re no longer effective. The only solution I have seen that is permanent are heated mirrors.

Sounds like experiment time. A silane primer might work but it would be hazy, not transparent.

Im amused by the auto correct i didn’t notice

Whatever you do will have to be washed occasionally. So that means your application must be permanent enough that it cannot be cleaned off.

I wonder if there is a clear water resistant appliqué. It would still be visible without the steamy room, but it would become much more noticeable with the steam.

Heat it from the back with low temp heater.

Ask these folks if they have a clear water resistant film. Their other products are water resistant, so maybe they do. https://artscape-inc.com/

@Lightlyseared Yeah still googling and haven’t found a long lasting one yet. Heating a mirror might be a bit complicated. Though wonder if there’s something that you could treat the mirror with that lets the glass absorb heat differently?

@RocketGuy I’m down to experiment! But need something clear and not hazy.

@snowberry I think you would be able to see the transition between mirror and plastic film?

@Tropical_Willie I think that works for a while mirror. Harder to control heat to present in a pattern because the heat would diffuse. But wondering if you could treat the mirror side to react to heat differently?

You can try regular glass etching but very lightly. It might be that a fraction of the standard etching time will result in a no fog effect without visible frosting texture.

@raum Sure, it would be minimal but always there. But it wouldn’t wash off.