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uPVC discoloration - the search for a remedy

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Some of the components on my three-year-old uPVC windows have discoloured. The supplier and subcontractor supplier agreed a faulty batch of extrusions was used at that time and proposed to carry out remedial work by applying solvent to remove the top layer and then treating with acrylic laquer. The supplier has not yet provided independent evidence that this approach is appropriate or durable.

Can anyone advise whether this is a common problem and offer comment on suitability of the process, and whether this is a standard industry technique?

Any references to test or research would also be useful.

Mike Pocock via e-mail

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