Please no whiter now or things like that. Looking for tested (local?) Preferable spray sunscreen.

Can you share positive experiences?

My underarms are white as snow and never burn.  Roll on deodorant with 'Whitener' sunscreen ... best product since sliced bread.

Not wise at all to risk your skin reading reviews here. Do proper internet research.

What's the problem with some random sunscreen bought in for example watsons or boots?

The last one that I bought is this one: https://www.watsons.co.th/เค.เอ.-ยูวี-เอ็กซ์ตรีม-โพรเทคชั่น-สเปรย์-เอสพีเอฟ50-พีเอ-200-มล./p/BP_279039

Didn't get a surburn even though spending quite some time in the sun, so it worked as expected.

Australia Cancer research are available at Watsons and sometimes Boots.

 

https://www.cancer.org.au/blog/cancer-council-and-sunscreens-what-you-need-to-know-this-summer

 

The thing about sunscreens is they often run off in water or sweat.

also people don't apply them correctly or mix them with other unctions - like mozzie repellant or deodorants which destroy their effectiveness.

 

Some sunscreens damage coral etc and are banned in parts of Thailand.