Slip, slop, slap, seek, slide has been a key message during Australian summers for generations. The iconic sun protection campaign reminds us to slip on a shirt, slop on sunscreen, slap on a hat, seek shade and slide on sunnies. But with summer holidays ahead, the Cancer Council has urged Aussies to be cautious about how they slop on their sunscreen, following new research by the Queensland University of Technology (QUT). The Cancer Council has urged Aussies to be cautious when slopping on their sunscreen.(iStock) The new research shows aerosol sunscreens are putting Aussies at risk of sunburn, with the products making it difficult to get sufficient levels of UV protection.