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GCSE Design and Technology · key term
A surface treatment that reduces absorption into timber or board, helping control moisture uptake or prepare it for further coatings.
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Component 1
Revise: Surface Treatments and FinishesA sealant reduces absorption into a surface. This helps limit moisture uptake and prevents the material absorbing too much of a subsequent coating. Sealing particularly absorbent areas helps produce a more even finish.
Distinguish a primer or sealant from the final finish: preparation layers help the finishing system work properly.
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