絹や綿の布に薄い紙を張り付けます。裏打ちの作業です。布にまんべんなくCMC糊をスクイージで伸ばします。薄い紙の方にも同じ作業をします。二つを重ね合わせ、ローラーを使って間の空気をできるだけ取り除きます。そしてそれを乾燥させます。
（その時にもし空気が入っていても、後で何とかカバーできるかもしれません。）
その布にボードを貼ります。私は2ミリ厚のボードを使っています。作りたい本のカバーのサイズを計算してボードを切り、それに合わせて布も切ります。
ボードの端を内側に張り付ける作業です。まずは長辺を張り付け、その後に短辺を貼ります。折り返しを考えて角を切り落としますが、それは布が糊を含み伸びるため糊付け後にやります。そして、角をの端をつめ等で少し織り込んでから短辺を張り付けます。（コツがいります。）
それをプレスにかけてボードと布を密着させてから乾燥させます。
これでハードカバーができます。
***CMC糊は、CMCが水になかなか溶けないので三日ぐらいほっときます。ミキサーを使っての時短の方法もあるみたいですが、私はしませんでした。
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Attach thin paper to silk or cotton cloth. This is the backing process.
Spread the CMC glue evenly on the cloth with a squeegee.
Do the same for the thin paper.
Place the two pieces on top of each other and use a roller to remove as much air as possible between them. Then let it dry.
(If there is air in the fabric at that time, you may be able to cover it up later.)
Attach the board to the cloth. I use 2mm thick board (left over from another use in the past).
Calculate the size of the book cover you want to make, cut the board, and then cut the cloth to fit. Even if you cut the fabric exactly right, be aware that the fabric will stretch as it soaks up the glue.
(I don't know how much it stretches, but it's definitely better to have it long than short.)
Sticking the edges of the board inside is another trick. I made a lot of mistakes and learned by heart. The first step is to attach the long side, then the short side, and cut off both ends of the corners of the short side. And then I cut off both ends of the corners of the short side, and then weaved in the corners a little with a nail or something before attaching the short side.
Then, press it to make the board and cloth adhere to each other, and let it dry. This is how you make a hardcover.
For CMC glue, the CMC does not dissolve easily in water, so leave it alone for about three days.
There is a way to shorten the time by using a mixer, but I didn't do it.
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