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We regret that you should have cause to be unhappy with the use of a Cuprinol product.
When decorating decking it is best to ensure that all surfaces, including edges and backs of boards are coated otherwise water may readily enter wood causing it to become saturated. High moisture contents may remain for some time in thicker timbers and prolonged periods of timber saturation may result in finishes losing adhesion. It is because of this that we advise on the can under the section "How to Apply" that treatment to all surfaces prior to fixing will give best performance.
Similarly it is imperative that the wood is dry at the time of treatment. If dew forms on a surface, timber rests on the ground or if there is dampness on the treatment before fully dry the performance may be reduced.
Two to three coats of stain are recommended for maximum protection on bare timber, thin coatings lead to rapid erosion to bare timber and failure of adjacent coatings by peeling and flaking.
If you have followed all of the above, then apologies. In order for Cuprinol to fully investigate the issue further, batch details and some of the flakes scraped from the deck would be required in order to carry out more extensive analysis in Cuprinol labs. By checking the back of the flakes they will be able to establish what level of preparation has been carried out.
In order to restore your deck, begin by scrubbing the top surface with a stiff bristle (not wire) brush and detergent (or pressure wash) to remove any loose material and dirt. Rinse with clean water and allow to dry before re-finishing with three coats of the Decking Stain. If possible the underside of your decking should also be treated.
I hope this can be of some help.