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Pondle said:Photostable means that it won't break down quickly upon exposure to sunlight. Many US sunscreens aren't photostable - they last less than 2 hrs. Avobenzone is a notoriously unstable sunscreen filter unless its paired with stabilisers. I think the Neutrogena Helioplex is a pretty good product. Not sure what its PPD rating is though. The PPD (anti-UVA) is usually a good indication of anti-ageing effectiveness.
Hey Pondle,
I searched Google and it said that the PPD rating of it is somewhere b etween 8 and 10 inclusive.
Is that good?
As for it breaking down in the sun, why not just apply regular sunscreen every hour and a half or so while out in the sun? Would that work just as well for UVA protection?