I know that many articles have been written regarding this topic but I feel it necessary to write this to promote what I feel needs to be more clearly addressed regarding the proper preparation and application of sealers.
Some of this may sound redundant but I can assure you that this post is being written to make more clear what is an extremely costly risk you are taking with a cavalier approach to resealing your concrete.
Years ago we at Split-Rok Construction could and did instruct our clients who were handy around the house on how to apply new sealer. Very easy to do and effective whether done by us or them provided they followed simple rules of application. Today that is not the case due to Government intervention into the sealer industry trying to prevent Volatile Organic Compounds from going into the atmosphere. Their mandate was to replace one type of solvent with another in HOPE that this would produce the desired result. Yes I am a fan of protecting the Earth at a reasonable cost but this was not well researched and therefore has done more to hurt my industry than would have hurt the environment if better thought out. The result of this poorly planned and unnecessary restriction has caused problems that have resulted in making beautifully installed stamped concrete turn white and hazy after application as a result of changing solvents.
The main mistake being made is assuming that we can, Apply new sealer over old thinking that Sealer is Sealer. This is longer the case since VOC sealers do not commingle well with Non-VOC sealers.
Unfortunately and fortunately there is a solution but it can be costly to perform but absolutely necessary to assure a good result. Removal of ALL old sealer by use of Water Sandblasting and thorough rinsing prior to new sealer being applied in thin coats. Thin coats seem to insure a good application result.
Very important to have ALL sealer removed and area be clean and dry and only apply sparingly. If applied to thick you risk to thick a coat and the same problem you had at the start comes back.
Sounds more tricky than it is but its very doable. Preparation is the key.
Should anyone reading this need more clarity about this process I can be reached by going to our site http://www.split-rok.com and drop me an email.
Thank you for your interest.
Split-Rok Construction Company