I know a little bit about a lot of things but this one is not something I have ever dealt with. Is it possable to become resistant to sun block? I slather on SPF 50 morning and noon yet still end up a bit too red at the end of the day. I tan easly and don't burn often. Im not on any meds that would make me photo sensitive or anything that I can think of. I have tried several brands with no change....Any dermatologists out there? :06:
Sun Block ??????
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...a few questions.
1. Where are you (geographically)?
2. What are you doing between slatherings (diving, hanging out in the sun)?
3. If you're in the water, is the sunblock water resistant?
4. How about just wearing a shirt so you don't get exposed to the sun? (A hat will also help to protect your face.)
1. Where are you (geographically)?
2. What are you doing between slatherings (diving, hanging out in the sun)?
3. If you're in the water, is the sunblock water resistant?
4. How about just wearing a shirt so you don't get exposed to the sun? (A hat will also help to protect your face.)
Sun Block works to block the amount of Ultraviolet (UV) rays that make it to the skin's surface through two different mechanisms.Wildcard:
The first mechanism is "light scattering" - keeping in mind the UV rays are referred to as light. UV rays are reflected in many directions (away from the skin) from microscopic faces of crystals of some pigment contained inthe Sun Block. The pigment is typically titanium dioxide (TiO2).
The second mechanism is through absorption by some substance in the wavelength range of UVa and UVb. A typical substance is para amino benzoic acid (PABA). The absorbed radiation is then re-emitted from the skin's surface as heat by the vibrational de-excitation of the excited state of the PABA .
The effect of the Sun Block is that same on your skin as it would be on any person or other object as it is acting on the UV rays and does not rely on any reaction with your skin to accomplish its job of keeping UV rays.
I think you will have to cross off becoming resistant Sun Block from your list of possibilities and put it down to a hyper-sensitivity to UV even in small quantities.
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Wildcard:
No, you cannot. You may wish to look into additional measures like wearing a hat, endeavoring to be in shade as much as possible, application of zinc oxide to especially susceptible areas, etc.
Best regards.
DocVikingo
Tanked Monkey
Contributor
Do you apply sunblock while you are already out in the sun?
You might be sweating the sunblock off before it has a chance to be absorbed by your skin. I know that if I apply it when it is hot, or while I am fiddling on a boat in the open sun, I can sweat it off pretty easily, and not even notice until I get red.
When I apply sunblock while cool (and not sweaty), and in a cool place, and give it 15 minutes or so to absorb, it works like a charm.
Just my 2 cents
You might be sweating the sunblock off before it has a chance to be absorbed by your skin. I know that if I apply it when it is hot, or while I am fiddling on a boat in the open sun, I can sweat it off pretty easily, and not even notice until I get red.
When I apply sunblock while cool (and not sweaty), and in a cool place, and give it 15 minutes or so to absorb, it works like a charm.
Just my 2 cents
pharmguy
Contributor
As mikeloyco said - applying the product before being exposed allows the sunscreen component (e.g. Parsol 1789) to penetrate into the dermal layer where it can better absorb the UV rays.
The sunblock component (titanium oxide) is there to provide immediate protection (think aluminum foil reflecting UV rays away). It doesn't absorb well and will be removed with moisture, movement, etc.
The sunblock component (titanium oxide) is there to provide immediate protection (think aluminum foil reflecting UV rays away). It doesn't absorb well and will be removed with moisture, movement, etc.
munkispank
Contributor
and I am assuming this is new sunblock- the stuf floses potency with ages (goes out of date ) allegedly.
Thats some great info, thanks, Im in the sun at work and do wear a hat, a big goofy looking thing made for fishing with a neck flap and oversized bill. I can't take the heat with long sleeves so it's just a t shirt but my arms do OK, mostly my face Im worried about....Guess I'll just try more sun block more often. Thanks again.
Mark Goodchild
Contributor
All the sun factor means is that it takes 50 times longer to burn in the sun. One golden rule....(trust me I know I burn like a crisp :disappoin ).....is to reapply it more often. I know its a pain but it works.
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