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August 7 - August 13, 2016

Can water be sprayed onto an IOZ coated surface that has not fully cured due to low-humidity conditions to accelerate the cure?

Selected Answers

From Andrew Smith of Akzo Nobel Pty Ltd on August 21, 2016:
I would like to recommend readers to an article by Gerald Eccleston (JPCL, JANUARY 1998) which answers this question nicely. Yes, water can be used to accelerate cure of Ethyl Silicate Coatings in low humidity conditions; however, in order to be effective, the water must be applied before the film has dried completely. A dried out film that has not cured properly cannot be resurrected.

Yes, we can use water spray onto an IOZ-sprayed coating in low humidity areas. It will accelerate the curing process. The painted surface must be dry to touch before spraying the water. Perform the MEK rub test to check if it is cured or not.

From David Lemke of Team Industries on August 14, 2016:
In climates where shops need to be heated in the winter, the heating of the building will suck the humidity right out of the air to levels where IOZ  might not cure at all. We developed a room where we induce timed misters of water and heat to create a sauna. Also when needed, we have hosed the items with fresh water. As stated previously, the IOZ should be dry to touch before you try to accelerate the curing process. Use an MEK rub test to check when the curing is completed.

From Chuck Pease of MMI Tank on August 11, 2016:
Yes, it can.

From Alfredo Claussen of Instituto Mexicano del Petroleo on August 9, 2016:
It depends... If the IOZ has just been sprayed and humidity can be raised by a fine mist of water, that can produce acceptable results; but if the IOZ was sprayed and some time has already passed, the top of the coating layer could be starting to cure (from the residual moisture of the atmosphere) and form a kind of barrier, preventing the moisture to be added to properly diffuse and reach the complete thickness of the layer, which could prevent reaching the desired and necessary hardness of the primer.

From Michael Beitzel of Modjeski & Masters inc on August 9, 2016:
Misting with water is acceptable when humidity is low and is most effective shortly after application after dry to touch.

From James Prevatt of SPEC-GUARD on August 9, 2016:
Yes, water is used when low humidity conditions are discovered, but it not a guarantee of complete success. Use the MEK 100-rub test to assure cure did in fact occur. If it did not, you will detect uncured IOZ shortly after many rubs. If the zinc is not fully cured, start again by full removal.

From Raymond Merrill of Texas Department of Transportation on August 8, 2016:
Yes, water can be sprayed on an IOZ-coated surface to accelerate cure.

From Per Gabrielsson of Free Lance Consultations and Inspections on August 8, 2016:
Please feel free to spray (fresh) water. If the surface is not wetted (or preferably kept moist/wet), curing will not take place in low humidity conditions, and the item has to be reblasted and recoated.

From Dale Waters of CBI on August 8, 2016:
Yes, water can be sprayed to accelerate the cure.

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