Ever since I've been diving 12 years ago I've had problems with my mask fogging. So once and for all I got really tired of it and started to research everywhere and everything I could find on mask fogging. I'll try to share as much as I can. I do not claim all the credit nor responsibility for the information here - as mentioned, these are all my own opinions from my own personal research :)
THEORY OF FOG
- Basically condensation happens when a moisture hits a cool surface.
- In this case, your mask lens is this cool surface.
- While you dive, the water outside cools the lens till it becomes great for condensation and thus fogging.
- The 'water' comes from the humid air INSIDE the mask from your face moisture or any other moisture inside the mask.
- So basically when this nice humid moisture ridden air hits the cool surface of the lens, it fogs.
THEORY OF NO FOG
- Technically there is nothing you can do with moisture condensing on your lens.
- What you CAN do is to make the moisture condense into a sheet of water that flows away to your base of your mask RATHER than sticking in little droplets on your lens (fog).
- You won't even notice the moisture that way as it is just flowing invisibly down your lens.
- So how we do this is by controlling the only variable we can...the lens itself.
- The 2 general ideas are to keep the lens CLEAN and free of anything that will 'trap droplets' and make the lens SLIPPERY (for lack of a better word) to reduce surface tension so that water droplets can flow uninhibited down the lens.
Read on to find out more of how you can do this.
KEEPING THE LENS CLEAN
This is the part where you and your mask are at home. To see if your mask will fog or not, simply breathe into the inside of your mask and see if it fogs. All my masks fogged till you couldn't see through them at all!
For
new masks, there is a residue (silicon) left over from the lens mounting process while manufacturing the dive mask. This residue causes your mask to collect fog (micro debris act as nuclei that causes water droplet formation). You'll need to remove this layer before using your mask otherwise it'll fog up.
For
old/used masks, you'll still need to clear them from any oil, grime, salt, dust etc. left over from any previous usage or just poor storage (in dusty places). You can follow this same process to clean them up. Any of the above mentioned contaminants will cause fogging.
I tried using dish-washing detergent and even a semi floor scrub with micro suds that are supposed to be abrasive enough but no luck. Finally I took the popular option of using toothpaste (Colgate in this case) and a toothbrush (fine bristles) and started 'brushing' my mask. Brushed at it vigorously for like 5 mins or more.
I breathed into the mask again and this time I saw that the part I had scrubbed did NOT fog! I was ecstatic and started frantically applying more toothpaste and scrubbed away focusing on those areas where fog was present. 2nd time, the non-fog area got bigger but there were a few more spots that still fogged. Being the perfectionist that I am, I repeated this step over and over again. Till at last after about 7 washes, the mask was completely clear. Be sure to wash away all residue left from this process. For me, I rinsed it about 3 times and then soaked it overnight in a pail of water.
If you happen to have cold water with you, you can 'cool' the lens with it before blowing your hot breath on the inside of it. This would improve the 'foggability' of the lens for testing purposes.
Some people wash their masks this way twice a day for an entire week before they dive. For me the principle is still the same, make sure its clean. You never know how 'well' relatively you wash a mask so just keep testing and trust your instinct.
Also take note that you'll have to wash the ENTIRE mask as sometimes the insides are greasy and oily too (skirting, nose area etc.).
You can never wash too much with toothpaste.
Heard some rumors about different manufacturers having different quality of lenses that are more prone to fogging. Have no idea how valid this statement is, anyone can verify?
Heard you can use wet newspaper as an alternative to toothbrushes, haven't tried it yet but theoretically sounds ok.
By the way, the masks used in this exercise should anyone be curious are the Atomic Frameless, Mares X Vision, a normal Problue and Saeko Mask.
ALTERNATIVE METHODS
Some people products like
Sea Buff and Jaws to clean the masks but for me plain old toothpaste worked just fine + its cheaper.
Some other people like to literally burn off the silicon by using a lighter. As I am a coward and love my mask too much to burn it, I did not try it so if you want to, do it at your own risk.
WARNING
There has been some words that some masks already come 'treated' and require no cleaning. These masks usually have a tag labelled 'No Abrasives' or something. Really not sure about these kind of masks, all I've read about is 'Sea Dive' one with some coating inside. Anyone have more information on this feel free to let me know.
If you happen to try 'fogging' your mask again after the mask dries off, you'll notice it fogs right up again! Please relax and don't worry, its because you'll need to move on the next important part. Read on...
TREATING THE LENS / DEFOGGING THE MASK
Once the lens is clean, defogging should be simple. For people who skipped the lens cleaning part, unless you're really lucky, your lens is probably gonna fog up no matter how much expensive defogger you use or even if you spit yourself dry. This is cause the layers of silicon or grime won't allow the defoggers to stick and can even trap droplets.
As mentioned above, the objective of defogging is to reduce the surface tension of the lens so that droplets do not form on the lens.
A good treatment should ideally (in order):
- should not hurt your eyes!
- be simple to do and easy to do in various situations
- be hardy enough to withstand some mask clearings
- be cheap and cost efficient
- be dignified and not gross (you'll understand why later)
After a lot of experimentation and research, this is what I personally do:
- First prepare your mask with J&J (non-diluted) and let it dry (6 hours at least)
- Get a small spray bottle with 50/50 J&J and water (you should bring more coz everyone will want to borrow it). Spray it on the mask before diving, use a CLEAN finger to 'clean up' the excess J&J from the initial prep (If you don't have a spray bottle you can just skip this step and move on. Its pretty much the same).
- If its still too much, then add some fresh water (a little!) and swirl it around and pour out.
- Your mask should just be clear enough for you to be able to see through quite clearly and then jump in.
Some Pointers:
- Be sure to hold the mask tightly to your face otherwise.
- Be careful of potential contaminants like hair gel, suntan oil etc. This will really fog up your mask if it gets inside.
- Related to the above point, really know how to put on your mask such that you don't rub your face all over it, get your hair or ears caught inside it or the straps etc. I know its basic but you'll be surprised how much this helps.
- Be WARNED that J&J causes the mask to be really slippery so be prepared and hold on tightly to it.
- Some people have all sorts of dilution ratios etc. Feel free to experiment. The only reason I can see for diluting it is so that you don't have to use water do spread it.
- DO NOT USE Rain X or even toothpaste as your defogger, yes it works and its cheap BUT it will hurt/irritate your eyes.
- You'll have to always be conscious of your mask through the whole pre dive set up (putting on BCD, fins etc) so that you don't contaminate it.
Crisis: You did not prepare your mask in advance with J&J.
No worries: Just put some UNDILUTED drops into the mask before you dive and use your CLEAN finger and spread it around. Use a LITTLE FRESH water should you really can't see through. If not just go ahead.
Crisis: You do not have J&J or have run out.
No worries: Ok just substitute J&J with any other commercial defogger like 500 PSI or
Sea Gold. Not the most cost efficient but well its not ideal.
Crisis: You don't have J&J nor any other defogger.
No worries: Just substitute with your own spit. Yes its gross and some people frown on it but well, there is no choice right.
TEST 'DIVE' EXPERIENCE
Just to share my 'testing experiences with you all'. Went to a swimming pool to test out the fogginess of the mask after treatment. After swimming up and down (to generate facial heat), will take off the mask and blow even more hot breath into it if it still doesn't fog. Following which, I went to rinse/clear the mask completely with water and repeat the above again.
Method: J&J already coat and dried on the mask, use a little water, swirl around and throw out.
Result: Generally worked very well and lasted about 3 mask clearings before fogging up.
Method: Add J&J to an already wet mask, use a little water, swirl around and throw.
Result: Lasted only 1 mask clearing before fogging up
Method: Add J&J to an already wet mask, DO NOT use water to rinse out.
Result: Initially a bit blur and hurt my eyes a little, cleared up after awhile, lasted 2-3 clears.
IN BETWEEN DIVES
So you had a fog free first dive (hopefully), if you want to keep the rest of your day like that you'll have to invest some time in keeping your mask in good shape for the next dive.
- Right on the onset, try to keep your mask as clean as possible by washing out any sea water or dirt that has gone in.
- Then just apply your defogger (whatever you choose to use) and let it set as per what you did even before the 1st dive.
- Keep your mask away from any containments etc. If you choose to keep it back in its box, MAKE SURE that the straps don't touch the inside of the lens as they will be very contaminated. You can just lengthen your mask and wrap the straps around outside the mask.
Masks get contaminated at the slightest quickest contact so be advised!
STUFF TO HAVE A FOG FREE MASK
- Johnson's and Johnson's No Tears Shampoo
- Spray bottle (even if its just water, its useful)
- Colgate
- Toothbrush (Fine Bristles)
- Fresh water
Bring ALL of the above on your trip as well.
POST DIVE CARE
- Wash your mask thoroughly with your toothbrush and toothpaste.
- Soak your mask in mild detergent or just fresh water.
- Dry your mask thoroughly and store in a box preferably in a cool dry place.
CONCLUSION
With all that said, please don't forget your other procedures for safe diving. Having a foggy mask is much better than drowning so try not to be too obsessed with it till you forget every other MORE IMPORTANT things.
Well ok here you go, hope this helps - If you disagree or have more tips/suggestions etc. Please please just let me know - we're all trying to get this right ya? :)
