TO:  Multi-Tech Products

I am a spa surface repair contractor. and have been asked to inspect and repair an acrylic spa for a manufacturer.  What should I do to provide a comprehensive inspection report to the manufacturer?




TO:  David

The most frequent types of surface damage to acrylic spas are blisters, discoloration, cracks and crazing.  Please read our website to gain and understanding of the description and causes for each of these problems.  You will see that a common thread through many of the problems is a chemical attack.  Therefore, when your mission is to repair the surface, you should also look for signs of a chemical exposure.  Since misuse of chemicals can void a warranty, the manufacturer will be very interested when there is indisputable evidence of neglect and misuse.  Chemical damage to the acrylic surface or mechanical components can be clear evidence of a contributing factor to the surface failure being reported by the customer.  Staining, fading, cracking, crazing, and blisters can all be at least partially due to improper maintenance of water chemistry, or the use of strong chemicals for cleaning, etc.  For example, organic chemical solvents can be absorbed by the acrylic, which weakens it, and contributes to cracking or crazing due to excessive stress.  Certain chemicals can attack the pigments, and cause fading or discoloration.  There have been past reports of problems caused by aromatherapy chemicals added to water by the owner.  Repair contractors often see calcium deposits at various locations in a spa.  This is a clear indication that water chemistry is not properly maintained.  Even some of the chlorinating chemicals (e.g. solid tablets)  can cause discoloration when they are in close contact with the surface for extended periods.  So, you should ask the owner questions to determine their practices for maintaining water chemistry, and list the chemicals they use.  Also, inquire about any other type of chemical that has been added to water for any reason.  You want to help educate the owner about proper chemical use, and warn them about things that cause problems.  If you do not know this, check with the manufacturer.

I hope this information helps to improve your expertise as a professional.


Ken Wolfe

MTP Consulting Chemical Engineer