Hi Glyn come over to Robsom Racing asap and we can give your visor a wipe with Rainex, its superb. Try a few applications for free see how you get on with it and if you like it we do a bottle of the stuff its a tenner a go, but the bottle will last about two years and Hundreds of applications.
Respro Foggy Mask, fits inside your helmet so that your breath is forced down & not up towards the visor. A little bit of washing up liquid rubbed onto the inside of your visor for back up & hey presto, no fogging.
I must be a heavy breather! I use a Foggy mask and a Fog City visor insert.
Together they are excellent - no misting up at all. I would echo other comments about being careful in the dark when using the visor insert. You get used to it, but there is a reflective effect that can be quite disturbing when you first experience it.
Mood: Channel Swim is now a (bad) memory not a dream
Could be the helmet. All heads are different shapes and all manufacturers make different shaped helmets eg, my head fits nicely into an Arai, (luckily), but not into some others. If you have a 'long' head, as if you've pushed your ears together, your chin/mouth/nose may be too close to the chin bar/visor. Try another helmet type for size in a shop and you may find the visor is further away from your breath and hence less chance of fogging up. Vents is another possibility. Some work a bit, some don't at all.
Anti-fog coatings prevent water droplets from forming on a surface by either absorbing the water into the coating or by sheeting the water across the surface.*
A water-absorbing coating acts like a sponge. It picks up water quickly in a dry state but eventually becomes saturated and no longer capable of picking up water. Like a wet sponge, coatings of this type become soft in their saturated state and are thus very susceptible to chemical attack, mechanical damage, and adhesion failure. Fog City products and Schuberth helmets uses this method. Wash with soap and water only!
A water-sheeting coating does not absorb water but rather spreads water across the surface of the coating, resulting in a transparent film of water. This sheeting effect comes as the result of highly hydrophilic (water loving) materials on the surface of the coating. Since coatings of this type can spread water into a film on a continuous basis, they will not water saturate and will not lose their normal abrasion resistance or chemical resistance properties.**
Make your own:
2 oz. white vinegar added to 1-quart water. Allow to dry on the inside of the shield.