For both materials (especially HD80), rough up the glue surface first with coarse sand paper, then apply a coat of cement and let it dry.
为两种材料(尤其是hd80)，粗糙了胶的表面首先与粗砂的文件，然后申请一件外套，水泥，让它干。
A coarse cotton fabric heavily sized with glue, used for stiffening garments and in bookbinding.
一种粗糙的棉质织物，有许多胶料，可用来使布匹变硬和装订书籍。
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