does spraying plants/buds with h202/water effect trichomes?

Like does it break off the trichome heads or degrade them?

I can't say for sure, but I suspect that the answer is, yes.
H2O2 oxidizes organic compounds, and the resin on the trichs is organic...

IMHO, reasonable amounts of water will not significantly damage your plants or trichomes. MJ plants have evolved with exposure to the elements including rain.

Are you talking about spraying them with hydrogen peroxide?? I've heard of people doing this to kill mold but I wouldn't spray the buds with anything after you see trichs forming..