I hope I’m in the right forum for discussing resurfacing my pool. In ground 25k gallon, concrete pool with painted plaster wall (I assume) is starting to show surface cracks. So off I go researching and came across UltraGuard and how it inhibits algae and is better than plaster or paint and more elastic. But then I read one of their pages about distrusting TPP. Anyone with a thought on them and their pool resurfacing solution or others to consider. Could something be done DIY, or is that crazy?