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Sat Jan 17, 2004 5:41 am  |
Hello everyone,
One question that has been plaguing me is the effectiveness of SPF used overnight-- does it breakdown and become useless after a certain period of time?
I do nightshift and moisturise and then put on sunscreen as I do normally before work (imagine a normal day only that I start at 10.30pm at night). I wear SPF religiously and figure that by the time I leave the building the sun is already up outside, so I'm protected. But I wonder if SPF becomes ineffective after a certain time? Is what I'm doing futile....should I skip the application overnight and bring some along and apply it in the mornings? Sorry if this seems like a silly question! :P:P
Thanks!
Summertimegirl |
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Thu Feb 12, 2004 1:36 pm |
From my understanding, the SPF thing will not be broken down overnight coz they are chemicals that work by reflecting the UVA and UVB, (that way, they prevent your skin from absorbing the harmfull UVs)the problem that the sunscreen will be ineffective happens only when it's actually gone, like being washed out by the sweat after you exercise, swimming, etc., so, the beauty experts suggest the use of waterproof ones so that it stays on skin and is more stable.
If you are working overnight, depends on the environment you work, it is also wise to use the sunscreen even if you are not exposed to the sun at night, reason is b/c a lot of lights, optical instruments, computer screen, etc are also emitting the harmful UVs, therefore, it is also advised to use a SPF 15 even if you are not working outside in the sun.
In the morning after work, I am not sure, I would say it's ok to reapply a coat of sunscreen, but I personally like to apply creams on a clean face, if you can wipe the dirt and debris a bit before applying it, it is better, or else, I am afraid that you will create a layer that the bacteria stay in between 2 layers of sunscreen .. also, you know, most of the sunscreens are rather greasy .. it doenst make me feel good on a "not-washed" face, face with some other creams and maybe the foundations ..it's like "unbreathable" : )
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Tue Feb 17, 2004 8:47 am |
Hello IZ,
Thank you for your reply ! I had thought it was quite a silly question to begin with but one I really wanted to ask. When no one anwered I thought the majority of people had normal lives and didn't work crazy hours like I do so maybe the Q didn't really apply to them ! :P
You've probably figured out that suncreen, sunblock, SPF.... are one of our favourite topics of discussions on the forum. Why, because simply being sun-aware we're starting to look younger than the generation before us at the same age !
I think it would make sense in what you said-- that the chemicals in the sunblock do not break down overnight and would continue to work unless it was removed through sweat or physically washed off. However I'm still not 100% sure, reason being is that it's 9 hours that the product has been on and although you don't sweat as much in an air cond environment your skin still metabolizes to some extent...
You also you mentioned a very good point-- UV radiation emmitted from computer screens. I never thought of that !!  But I wonder if 'Broad Spectrum' also covers this kind of radiation ??? I work for 6 days straight in front of computer screen for hours at a time.. at least my skin was protected all along ! It's my eyes I worry about more, as they become sore and blood-shot during my night shifts. I'm switching to glasses very soon.
To be on the safe side, I think it's a good idea to apply a fresh coat of sunblock after I finish work before I go outside. Usually the sun is deathly bright, and I'm looking like death warmed up so it really doesn't matter as long as I'm not burning ! :P Normally I don't wear foundation overnight to work on a night shift, just my usual night moisturiser which is quite rich (Phytomer's Extended Youth Night Cream), my skin drink. 
Thanks again Iz ! you got me thinking ...
Summertimegirl x |
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Mabsy
Moderator
 
Joined: 17 Aug 2003
Posts: 9644
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Wed Feb 18, 2004 4:55 am |
I think UV radiation from computer screens particularily (only CRTs, LCD monitors do not have these problems and are the recommended "healthy" option) is actually quite negligible. The thing that is more likely to cause you any harm are the x-rays (also tiny amounts though). Good news is that the UV radiation is very small to begin with, plus it gets filtered out by the thick glass. The other radiation (X-ray and electromagnetic) mostly come from the sides and the back of the monitor. So I guess you could say that if you need to be anywhere near a CRT monitor then right in front of it is the safest place.
I just had an image of myself walking into my office pale and walking out with a tan 8 hours later  How cool would that be! Unhealthy, but cool! Plus if they could crank up the radiation they could do a two in one product! TV/UV lamp. Watch Seinfeld while you tan! |
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Wed Feb 18, 2004 5:23 am |
LOL !! Mabsy, you crack me !! Now that would be awesome, getting a tan whilst watching Seinfeld!
I'm glad the rays we're getting inside the office aren't all that harmful, otherwise I would be spitting blisters off my face !! You reminded me that I've also got to stop watching my food heat up at work in the microwave, there's radiation coming out of those as well... I went and checked out some glasses today and found some cool ones so will look quite the geek soon !:P
Summertimegirl x |
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