CLEAPSS DT - Supporting practical work in science, technology and art

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Traditional polishes are formulated for multiple thin-coat application to wood to give, with suitable manual polishing, a high-quality finish. They are not intended for exterior use. Polyurethane varnish gives a tough and resistant finish in indoor and outdoor applications. (Some twin-pack polyurethane finishes are not considered suitable for school use: see overleaf.)
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