Clive Hall Models






Nylon covering the easy way

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First dope all areas to be covered, then sand off the inevitable surface roughness and give a coat of sanding sealer. Rub this down lightly and then give another coat. Cut out a piece of nylon 1 inch all round larger than the area for covering. If it is creased, iron it to make it smooth. Lay it in place . . .

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 . . . and gently spray it with water. It will expand slightly and sag across any open areas such as built-up wings.

Wait ten minutes for the soaking to take full effect, and for the full expansion to develop - there will be a little more sagging.

Now gently rub the edges of the nylon away from the centre to remove the wrinkles and make the nylon lie smoothly in place. Do not try to make it tight, just wrinkle-free. If the nylon shows any signs of drying out give it another gentle spray with water. It has to remain damp through the whole process.

Brush thinned clear shrinking dope along the outer edges of the nylon and rub it lightly into the nylon away from the centre. This will again remove wrinkles or any looseness, but again do not try to make it tight. It will tighten evenly later when the whole area is doped. If it is pulled tight before overall doping it will tighten too much later and will probably develop warps or distort some structural members.

Finally let it dry completely then give it a coat of shrinking dope. When this has dried the surplus nylon may be trimmed away from the edges.

In all of this process there is no need to hurry. The nylon can be kept damp by repeating the water spray if it shows signs of drying out. While it is damp, take your time. When the edges have been doped and the nylon is dry it may happen that there will be some small patch where there is a wrinkle. At this stage it is easy to fix. Damp the whole area of nylon again, wait for ten minutes, then use thinners or acetone to release the dope at the edge near the problem. Ease the wrinkles out, make sure the edges are stuck down again, let it dry and then finish the process as before.

After the first thin coat of shrinking dope another coat is recommended, followed by  a full coat of non-shrinking dope. After that the nylon is sealed and flyable; all it needs is a colour scheme and, for glow engines, fuel proofing.