My ecofinish looks terrible so I would not say that all installers that have been trained are qualified. Ecofinish even sent a rep out the 3rd time we had the finish applied. Now we have terminated the contractor as it was well over a year and our pools still wasn't done (for more reasons than just the finish). We have called Ecofinish to see if they will help us find someone to make it right. They said they would come out mid-April but I am not holding my breath that they plan to stand behind this installer they "trained". Ecofinish told me that our new contractor would never be able to blast off the old finish and revert to plaster. I would not recommend this product - at least not in our area where there is only one installer.