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How do you re apply sunscreen?
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faeriedust
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Tue Feb 23, 2010 7:43 am      Reply with quote
If you wear makeup and you dont want to mess it up.

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23yr old Asian with combination skin prone to clogged pores. hyperpigmentation from pimples. uneven skintone, scars
hellenzqq
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Tue Feb 23, 2010 7:47 am      Reply with quote
i use powder with spf
circus
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Tue Feb 23, 2010 12:10 pm      Reply with quote
Sounds redundant, but i choose a sunscreen that is stable so i won't have to re-apply.

Second what hellenzqq said. You can try zinc oxide powder. But i really dunno how much of a sufficient protection you are going to get with a light dusting of powder.
3rd.oculus
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Tue Feb 23, 2010 12:36 pm      Reply with quote
You may want to be careful if you're combining 2 different sunscreen products. Certain ingredients destabilize others, reducing their effectiveness.

For example, mineral makeup with SPF contains zinc oxide and titanium dioxide, which can cause the avobenzone in many liquid sunscreens to degrade.
Auu
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Tue Feb 23, 2010 11:53 pm      Reply with quote
I think a foundation with high spf will help you. You can simply reapply as you want.
fat_swan
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Wed Feb 24, 2010 12:01 am      Reply with quote
Can't you use one of those spray sunscreens? Or powder/foundation with SPF

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Asian. Near 30. Prone to broken caps, moles + freckles, large congested pores, hormonal cystic acne, flaky skin and fat puffy eyelids. Staples: Bioderma SS, Taz, Dr. Kassy's C, Skinoren, HQ, Cerave and growth factors-- but also trying EVERYTHING ELSE.....
faeriedust
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Wed Feb 24, 2010 8:05 am      Reply with quote
circus wrote:
Sounds redundant, but i choose a sunscreen that is stable so i won't have to re-apply.

Second what hellenzqq said. You can try zinc oxide powder. But i really dunno how much of a sufficient protection you are going to get with a light dusting of powder.


How do you know if a sunscreen is stable? Im using la roche posay suncreen.

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hellenzqq
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Wed Feb 24, 2010 8:44 am      Reply with quote
faeriedust wrote:
circus wrote:
Sounds redundant, but i choose a sunscreen that is stable so i won't have to re-apply.

Second what hellenzqq said. You can try zinc oxide powder. But i really dunno how much of a sufficient protection you are going to get with a light dusting of powder.


How do you know if a sunscreen is stable? Im using la roche posay suncreen.


would like to know too! thanks
hellenzqq
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Wed Feb 24, 2010 8:48 am      Reply with quote
hi, i just found this website and it is said the avene backordered this product

does anybody know anything about the reason?

since Tinosorb is still so new....would like to know more
circus
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Wed Feb 24, 2010 12:53 pm      Reply with quote
hellenzqq wrote:
faeriedust wrote:
circus wrote:
Sounds redundant, but i choose a sunscreen that is stable so i won't have to re-apply.

Second what hellenzqq said. You can try zinc oxide powder. But i really dunno how much of a sufficient protection you are going to get with a light dusting of powder.


How do you know if a sunscreen is stable? Im using la roche posay suncreen.


would like to know too! thanks


I would consider a sunscreen to be photostable if it does not degrade considerably under sunlight.

Short story:
Avoid a combination of Avobenzone and Octinoxate. This combination degrades fastest.

Avobenzone on its own is the most unstable filter.

Octinoxate is also unstable, but would degrade slower than Avobenzone.

The latest consensus is that Oxybenzone is also unstable.

Slightly longer story:
For Avobenzone on its own (without Octinoxate), the following will help stabilise it.

Octocrylene, 4-Methyl Benzylidene Camphor, Tinosorb S, diethylhexyl 2,6-naphthalate.

Mexoryl SX and Tinosorb M also improve the photostability of avobenzone.

But Avobenzone is destabilised by zinc oxide and titanium dioxide.

Short cut Laughing :
Your La Roche-Posay sunscreen is stable. Avene, Bioderma and generally the Euro sunscreens are all stable. Physical sunscreens are stable too.

The only concern you might deal with is if your make up has SPF, then you will need to check through the ingredients. Whether your sunscreen and make up would destabilise each other.
circus
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Wed Feb 24, 2010 1:11 pm      Reply with quote
Avobenzone = Butyl Methoxydibenzoylmethane = Parsol 1789 = BMDM

Octinoxate = Octyl Methoxycinnamate = Ethylhexyl Methoxycinnamate = OMC

Oxybenzone = Benzophenone-3 = OXY

Octocrylene = OCTO

4-Methyl Benzylidene Camphor = 4-MBC

Mexoryl SX = Terephtalilydene Dicamphor Sulfonic Acid = Ecamsule

Mexoryl XL = Drometrizole Trisiloxane

Tinosorb S = Bis-Ethylhexyloxyphenol Methoxyphenyltriazine = BEMT

Tinosorb M = Methylene Bis Benzotriazolyl Tetramethylbutylphenol = MBBT



If anyone's curious and want to look at ingredient lists.
Ok enough science for now. Bad Grin Bad Grin Bad Grin
3rd.oculus
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Wed Feb 24, 2010 9:49 pm      Reply with quote
circus - thanks! I'm definitely a label-reader, and hate how the companies always call the ingredients prettified names in the marketing copy.
hellenzqq
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Fri Feb 26, 2010 12:19 pm      Reply with quote
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