Leave the weights in place until the adhesive sets.
Carpet seams do it yourself.
With white chalk make a line about 3 4 the width of the overlap or about 1 3 4 inches from the edge of the carpet and then cut along the line.
In this video i share an easy strategy to cut and seam carpet.
Try using a clothes iron and you might as well shoot yourself in the foot.
Apply seam adhesive to only one edge of the carpet.
Overlap two pieces of carpet at the seam by about two inches.
Place the seam tape under the exposed edges.
Complete the seam by butting both sections of the carpet together while the adhesive is still wet allowing the carpet and cushion to make contact with the tape and seam sealer at the same time.
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Latex based sealers act as a glue for fixing the edges of the seam by sticking it to the surface below.
Next make one inch cuts every two to three feet all the way through to the bottom piece.
Be sure to keep carpet fiber up and away from the seam sealer.
As you move down the seam with the iron roll over the joined seam behind the iron using a seam roller to press the carpet edges into the tape adhesive and ensure they lie flat.
After rolling place heavy objects such as large books over the rolled area of the seam to hold the carpet in place.
Seal the unruly carpet edges with a seam sealer.
Set the iron on 300º 350º depending on the carpet the carpet backing and the seam tape.
Drag the heated seaming iron over the tape.