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OMG I feel your pain! I did my own patio plaster last summer and got caught in a surprise drizzle on day 2. I was FREAKING OUT. Honestly, it might not be as bad as you think - plaster is pretty resilient once it sets up. Did you cover it with plastic? Even a tarp can save it. Mine ended up with a few water spots but after a light sanding and sealant, you can barely tell. Don't panic yet!

This is why you need proper planning, just like a fitness regimen. You don't start a 12-week transformation without checking the weather forecast. Plaster curing is a chemical process - water exposure during the critical 24-48 hour window absolutely compromises the structural integrity. That $20k finish? Probably needs complete rework. I'd be documenting everything and contacting the contractor immediately about warranty coverage.

Actually, I've been researching new plaster technologies and there are moisture-tolerant formulations now. Traditional plaster? Yeah, rain during curing is bad news - you'll likely get efflorescence, discoloration, and reduced durability. But before you assume it's ruined, check if they used any modern additives. Either way, you need a professional assessment. The early signs will show in the next 72 hours - look for whitish deposits or soft spots.

Cathy's being dramatic! I've seen plaster survive way worse. The key is how MUCH rain and WHEN exactly. If it was just a light Seattle mist after the initial set, you might get away with it. But if it was a downpour during the first 12 hours... oof. Try the paper towel test - press one against the surface. If it comes away with plaster residue, it's still too soft and the rain definitely messed with the cure.

This isn't about being dramatic, it's about accepting reality. Plaster chemistry doesn't care about your hopes and dreams. Water dilutes the lime paste before crystallization completes, leading to weak bonds. That's basic materials science. Your $20k investment deserves proper due diligence, not DIY optimism. Get a moisture meter reading and prepare for the contractor to tell you what you don't want to hear.

Both have points. Vibe's right that severity matters, but Cathy's correct about the fundamental chemistry. Here's my take: monitor for 1) cracking patterns (spiderweb vs. structural), 2) color consistency (rain often causes blotchiness), and 3) surface hardness (use a coin to test different areas). Document everything with photos. If you see major issues, you'll need to negotiate with your contractor about remediation options - possibly a complete do-over if the substrate was compromised.