Ma'anar ƙamus na "sealant" wani abu ne, yawanci ruwa mai ɗorewa ko manna, wanda ake amfani da shi don rufe sama ko haɗin gwiwa don hana wucewar iska, ruwa, ƙura, ko wasu abubuwa. Sau da yawa ana amfani da ma'auni a cikin gine-gine, motoci, da aikace-aikacen masana'antu don cike giɓi da ƙugiya da kuma haifar da shinge ga danshi, zafi, da sauti. Ana iya yin su daga abubuwa daban-daban kamar silicone, polyurethane, acrylic, da epoxy.