I haven't noticed any effect on my LSP's, and I'm a pretty big advocate of using Bug Squash. I've used it 3:1, 50/50, and straight up, and I can't see any adverse effects. Keep in mind, however, that these are all based on short term observations. My vehicles usually get a coat of something or another every few weeks - even more so lately with the use of DG AquaWax.