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February 27 - March 4, 2012
If a paint data sheet notes a required primer thickness of 125 microns, but the project specification calls for 50 microns, how is this resolved?
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Coating Application
Selected Answers
From
Kumar Kolur Vadivelu of Intertek-Moody International-UAE on
March 25, 2012:
Sometimes, the project specification is not adequate with respect to paint manufacturer's recommendation. In this case, we can arange a meeting with client/paint manufacturer and resolve the same. My openion is we have to follow paint manufacturer's recommendation to obtain optimum coating performance.
From
Karen Fischer of Amstar of WNY on
March 2, 2012:
The more important question is WHEN this discrepancy should be resolved and by whom. Ultimately, there are three players involved, all of whom may be "damaged" by not getting this resolved prior to the start of the work. The coatings manufacturer needs to insure that the product is applied per the data sheet (warranty issues); the contractor must apply the coating to insure the best possible performance required of the specifications and contract; the specifier/owner must insure the work is performed to obtain the best value and best performance. If Specifiers require a specific system, they should specify that the system is to be applied per the PDS, thus, making the PDS the controling document for mixing, application and curing/recoat. OR, there should be a statement in the contract documents that the more stringent requirements be met if there is a conflict between the contract documents and the PDS.
From
mohame okaz of international co. on
April 22, 2012:
I must follow the specs, but advise the specifier.
From
M Ehab of North Valley on
February 29, 2012:
Apply Data Sheet minimum DFT.
From
Jay Mitchell of James Hardie Company on
May 16, 2012:
The problem as stated is not clear on whether or not the project specification called out the exact same primer as the one on the data sheet from the supplier. If only a certain type or class of primer is specified, then it would be advisable to find an alternative to the supplier's primer that would meet performance requirements at the lower film thickness. It is possible, though, that the supplier data sheet or the specification contain erroneous data for the film thickness. The only way to resolve this adequately is to obtain clarification from the supplier and specifier, confirmed in writing, including any required deviations, before proceeding with the project. Otherwise, the contractor runs the risk of paying fines for non-compliance and/or product failure.
From
Erik Andreassen of CFPS on
February 29, 2012:
In 40+ years of our wonderful industry, I have come across this so many times. Whilst we should, as others say, follow the specification, I question the ability sometimes of the people who specify systems without first consulting the coating suppliers.When you check specifications, they quote products but at the last resort usually cover themselves by saying all products shall be applied as per the recommendations of the coating manufacturer in use.
From
Bill Patterson of Retired on
March 2, 2012:
I concur with the four answers to date, but the technical aspect they address is only ½ of the answer. The other ½ is the money. If the technical answer is 125 microns, the successful bidder will want to be paid for 250% of the original material cost, whereas, if the specification includes the proviso to comply with the manufacturer's recommendations, the owner will disagree and the spec writer will likely side with the owner.
From
Mohd Irzal Ridzuan of Velosi on
March 15, 2012:
Follow the specifier or the end user. With respect, the specifier knows exactly the purpose of the specified DFT for the material.
From
ROYER Jean baptiste of protective engineering on
March 2, 2012:
Usually, you specify in the data sheet the optimum thickness according to the formulation. An optimum between particle size (you might have coarse micaseous iron oxide, for example) pigment, binder ratio ... all that concour to the efficiency of the coat. I think you better keep the producer data and discuss on the intermediate coat thickness.
From
Jacek Bordzilowski of CES on
March 5, 2012:
The primer has to be applied according to PDS recomendations. Too thin a primer coating will not ensure sufficient protective properties. In this case, the specifier should be asked to change the primer.
From
James Albertoni of CA Department of Water Resources on
February 27, 2012:
The best approach would be to contact the specifier and figure out if there is a specific reason for the discrepancy. Then get the coating manufacturer involved to ensure that the discrepancy will not affect the coating's performance. At the end of the day, the specifications always govern.
From
Wilfred Offor of Intertek Moody on
March 2, 2012:
The thickness required by the project specification governs the application of the primer thickness irrespective of the paint data sheet; that is, the contract was written without error. Unless, if the contract or the scope of work was written in error or from lack of knowledge, then the data sheet primer thickness supersedes the project specification.
From
david cuthbertson of savcor on
February 27, 2012:
Generally, it is resolved by submitting a Technical Query to the specification writer with the most recent Product Data Sheet recomendations. This should be sufficient, but the specifier may have very good reasons for the difference. So go with the specification.
From
Steve Drinkell of Home on
February 27, 2012:
For best clarity, you must get both the material manufacturer and the specifier around the table. It is their responsibility to resolve specification issues.
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Tagged categories:
Coating / Film thickness;
Primers
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