Regarding the question of whether it’s possible to skip the end caps and just use silicone glue to seal the cut ends of the neon flex, we strongly advise against this. While applying adhesive directly may seem simpler, it poses significant quality risks in practice and long-term use. The reasons are as follows:
  • Risk of Liquid Loss: Professional silicone sealant is a fluid liquid before curing. Without a stopper to hold and regulate its position, the adhesive will flow downwards due to gravity.
  • Creating Water Leakage Gaps: As the liquid adhesive flows away, the sealant layer at the cut edge becomes extremely thin, even developing gaps. After the adhesive dries completely, microscopic gaps may remain within the waterproof layer, leading to waterproofing failure.
  • Lack of Structural Protection: The stopper is not only a container but also a mechanical protective layer, preventing direct pulling on wire solder joints.

To ensure the success of your outdoor projects, do NOT just use silicone glue to seal the cut ends of the neon flex. Please follow the effectively 4 steps. What’s more, we strongly recommend using a dedicated silicone end caps for standardized installation. To learn about advertising neon sign end caps, please click to view related content.

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