Luckylouie wrote a great review for this product. I believe that review is below mine, check it out. Have you read it? Back here? OK, I have something to add about the white cast that this product leaves on your face after application -- it is probably caused by the zinc oxide, which is also in Sudocrem (a diaper rash cream the colour of canvas primer paint.) This is what I have to say about the white cast from Hamilton Sensitive Sunscreen... read on:

Yes, this sunscreen does make your skin look white! But if you are as pale as I am, it shouldn't really matter. I have tried to make this sunscreen into a tinted moisturizer by mixing in some MAC NC20 Select concealor before applying it (I just mix both liquids on the back of my hand), and it looks very natural, not too "white" (to me, anyway). I don't even need to use a lot of concealor for mixing, just a pea-sized amount gives me quite heavy coverage.

I would probably repurchase this sunscreen as long as I can find it because it doesn't bother my sensitive combination skin. I can't tolerate silicones and it has never broken me out. It doesn't feel greasy (to me) although it does leave a nice dewy sheen, which I think keeps the white cast from looking chalky. It stays on for most of the day unless I sweat and wipe my face with a handkerchief. It is odorless. And finally, it is easy to remove. I buy the tube version, which is creamier and easier to control than the one that comes in a bottle.

Luckylouie mentioned that it made her teeth look yellow. I have not noticed that effect on me... but then again, in photographs I have a closed-mouth smile, probably because I think my teeth look yellow anyway. :-)

Hamilton is an Australian company that make a range of sunscreen products (they also make Neostrata skincare). Sensitive for Hypersensitive skin is a sunblock with 2.9% zinc oxide and 8.8% titanium dioxide and no chemical uv absorbers. It is light, water resistant for 4 hours and fairly non greasy. It doesn't block my pores and it is fairly easy to remove in the evening. I have dark hair and light olive skin, and while it does leave a faint white cast, it really isn't that noticable. The only downside of this product is that it tends to show any flakes of dry skin and I would prefer that it came in a tube rather than a bottle as I feel that it would be easier to apply. As with all physical sunblocks, it can come off on clothing, which is mildly annoying, but clothing is washable, so why should I care. I have tried natural physical sunblocks that contain zinc oxide only, and unfortunately they all block my pores and are difficult to remove at the end of the day. Chemical sunscreens are okay for me, but not if I am out in the sun all day. This does the trick and at around $12 for 125mls, it is reasonably priced. There is also larger and smaller sizes available.
Edit - This leaves a much whiter cast than I originally thought. It makes both my teeth and eyes look yellow in comparison. Alas I will not be rebuying this and the rest of it will end up used on my hands and arms. No Hg here.