Set Back City

I had been making progress, slow but sure on my Pice CIty Bridge scene, here it is after the first coat of Woodland Scenic water. everything went great. Then I applied the second coad (no pictures, sorry) the product was fine, I think I had some changes in room temperature that adversly affected it, I got rippling then bubbling. The scene was ruined. I've torn it apart and am trying to salvage the bridge to try again...