Very often the hot melt applicators/guns used to apply high temperature polyamides for splices in roofing plants are completely insufficient.

They offer minimal melt rate in the heated pressure tube. They offer minimal output rates as they are only pressurized with air to a maximum of 60 psi. The temperatures are set too high to compensate for their limited melt capacity and they degrade the adhesive.

This affects the bond strength of the adhesive. This type of applicator is also breaking down constantly. Finally, it requires regular filling - exposing operators to high temperature adhesive.
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Fiberglass Gluing in Roofing Plants - by Pierce Covert,
Glue Machinery Corporation
www.gluemachinery.com