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Technical Blog

Quarterly Updates from Lonseal's Technical Team


Eliminating Glaze From Heat Welded Seams

In the resilient flooring industry, heat welding is the process of fusing two sheets of flooring using a hot air tool and welding thread to create a continuous flooring layer that is impervious to moisture and debris.

Lonseal manufactures welding thread for most of its 200+ flooring products. Our Heat Weld Guide and Welding Thread Technical Data Sheet cover the method of heat welding.  However, there is a specific aspect of the normal welding process that we get asked about frequently that we will cover in this post.

While heat welding with our Standard Speed Nozzle (Part #ZZ27) on any of our unfinished flooring, the installer may notice a glaze on either side of the seam, making them shiny in appearance.  This glaze is normal, and as long as the flooring has not developed noticeable burn or scorch marks, from moving too slowly along the seam or using too high of heat, the performance of the flooring is not impacted.  After the application of a floor finish, the visibility of the glaze will become less noticeable or diminish completely.

Some customers choose not to apply a floor finish after installation*, and in this case, the glaze will remain visible but may fade away over time through foot traffic and regular maintenance.  In order to eliminate this initial glaze, the installer has the option to use our Urethane Nozzle (Part #ZZ65) for the heat weld instead of our Standard Speed Nozzle.  A Urethane Nozzle is required when heat welding floors with a factory-applied urethane finish, such as our floors with Topseal and High Gloss factory finishes.  The design of the Urethane Nozzle concentrates the heat into the groove of the seam, and if used to weld our unfinished floors, it can eliminate the glaze.

Remember that using the Urethane Nozzle will require higher heat and slower movement along the seam when compared to a Standard Speed Nozzle. If you are unfamiliar with using a Urethane Nozzle, please make sure to practice on scrap flooring following the methods described in our heat welding documents linked above. Doing so will help ensure installed flooring is not damaged, as this could require replacement of your newly installed floor.

Below are example images of heat welds using our Standard Speed Nozzle and Urethane Nozzle. Six coats of Hilway Direct PLUS Floor Finish/Maintainer were applied to the sample that was heat welded with the Standard Speed Nozzle to show how the finish minimizes or eliminates the appearance of the glaze.

Lonwood Performa W549 “Silver Lake” with Standard Speed Nozzle Weld

Lonwood Performa W549 “Silver Lake” with Standard Speed Nozzle Weld and Finish Application
Lonwood Performa W549 “Silver Lake” with Urethane Nozzle Weld

A list of our Floor Finish options and their respective Maintenance Guides may be viewed by visiting the Maintenance section of the Lonseal website.

*Lonseal highly recommends all unfinished flooring receive a finish.  Failure to apply a finish will make maintenance more difficult and impact the flooring’s performance. It could also lead to premature wear and impact the limited wear warranty.