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Technical Information

Custom Corners

This guide is intended to give design engineers the basic facts needed to begin the process of designing effective rubber seals, gaskets and weather stripping. It is not intended to provide every piece of information available on the process or extrusion, the amount of information available is simply too great. However, it should serve as a starting point and give engineers the necessary information to better understand what they will need to consider during the design process.


Trim-Lok offers custom corners to meet any customer's specifications.  Corners can be fabricated into a variety of configurations through molding, hot splicing, or cold bonding. 

Molded corners yield the ultimate corner.  Rubber is injected under high pressure to bond the two pieces into a complete corner.

Hot splicing uses a similar method to molding.  However, hot splicing bonds the corner extrusions by "buttering" the ends with a liquid rubber adhesive and heat curing the parts into a complete corner.

Cold splicing seals the two ends by applying an air cured adhesive to create a complete corner. 





Trim-Lok's patented All-in-One Wipe Seal System provides a consistent seal around the slide out room opening with no seams at the corners, unlike all other slide out seals that are installed with seams in the top corner of the opening!  Trim-Lok’s one-piece design drastically eliminates water intrusion in an area that OEM’s have struggled with since the development of the slide out decades ago. Trim-Lok’s All-in-One Wipe Seal System features a bulb with an “outer leg” creating an improved sealing surface against the slide out facia and acts as a gutter to divert water away from the room opening, improving overall water management.  

The All-in-One Wipe Seal System can make a perfect 90-degree turn without a seam in the bulb by making a 3/4” cut through the flap and base at the upper corners of the room opening, resulting in a continuous seal around the top and sides of the room opening! Trim-Lok’s patented All-in-One Wipe Seal System and installation method simplifies and shortens installation time, as well as reduces parts in the BOM. 
Learn more about our patented seamless corner installation by watching our How To Install video.



Choosing the Right Adhesive Installation Videos