COMPARISON
Gasket makers and flange sealants compared by handling and cure time
21 products in our catalog state a time for handling or cure, from 25 minutes (Loctite (Henkel) 518 Gasket Eliminator Flange Sealant) to 3 days (Loctite (Henkel) SI 598 Black Silicone Gasket Maker). The median is 1 day. The table shows the 20 shortest, built only from numeric times in manufacturer documents.
Comparison table
| Product | Manufacturer-stated minimum | Condition/source |
|---|---|---|
| Loctite (Henkel) 518 Gasket Eliminator Flange Sealant Tube | 25 minutes | The source gives no conditions for this time. |
| Permatex Aviation Form-A-Gasket No. 3 Non-hardening gasket sealant | 1 day | Dry times vary with temperature, humidity and gap. |
| Permatex Form-A-Gasket No. 2 Non-hardening gasket sealant | 1 day | Dry times vary with temperature, humidity and gap. |
| Permatex Optimum Black Gasket Maker RTV silicone gasket maker | 1 day | Cure times depend on temperature, humidity and gap. |
| Permatex Optimum Grey RTV Silicone Gasket Grey RTV silicone (all sizes) | 1 day | Cure times vary with temperature, humidity and gap. |
| Permatex Optimum Red RTV Silicone Gasket Red RTV silicone (all sizes) | 1 day | Cure times vary with temperature, humidity and gap. |
| Permatex Permatex Form-A-Gasket No. 1 Sealant Non-hardening gasket sealant | 1 day | The source gives no conditions for this time. |
| Permatex Permatex High Performance Thread Sealant Pipe thread sealant with PTFE | 1 day | At 72°F (22°C). |
| Permatex Permatex High Temperature Thread Sealant Pipe thread sealant, 400°F | 1 day | At 72°F (22°C). |
| Permatex Permatex Maximum Temperature Thread Sealant with PTFE Pipe thread sealant with PTFE | 1 day | At 72°F (22°C). |
| Permatex Permatex Pneumatic/Hydraulic Sealant Pipe thread sealant | 1 day | At 75°F. |
| Permatex Permatex The Right Stuff Gasket Maker Instant gasket maker | 1 day | At 23°C (73°F) and 50% relative humidity. |
| Permatex Ultra Black Gasket Maker Black RTV silicone (all sizes) | 1 day | Cure times vary with temperature, humidity and gap. |
| Permatex Ultra Blue RTV Silicone Gasket Maker Blue RTV silicone (all sizes) | 1 day | Cure times vary with temperature, humidity and gap. |
| Permatex Ultra Copper RTV Silicone Gasket Copper RTV silicone (all sizes) | 1 day | Cure times vary with temperature, humidity and gap. |
| Permatex Ultra Grey Gasket Maker Grey RTV silicone (all sizes) | 1 day | Cure times vary with temperature, humidity and gap. |
| Permatex Ultra Red Gasket Maker Red RTV silicone (all sizes) | 1 day | Cure times vary with temperature, humidity and gap. |
| Permatex Water Pump & Thermostat RTV Silicone Gasket RTV silicone (all sizes) | 1 day | Cure times vary with temperature, humidity and gap. |
| Loctite (Henkel) SI 5140 Silicone Gasket Compound Silicone gasket and sealing compound | 3 days | Cured properties are listed after 1 week at 21 to 26°C and 50% relative humidity. |
| Loctite (Henkel) SI 587 Blue Silicone Gasket Maker High-performance RTV | 3 days | Moisture cure; cured-material properties are reported after 7 days at 25°C. |
Quick answers
Which has the shortest stated time for handling or cure?
Among the 21 products in our catalog with a numeric milestone for handling or cure, the shortest is Loctite (Henkel) 518 Gasket Eliminator Flange Sealant at 25 minutes.
How wide is the range for handling or cure?
Stated times run from 25 minutes to 3 days, with a median of 1 day across 2 manufacturers.
What can change the order?
Temperature, humidity, thickness, airflow, surface preparation and what the manufacturer means by this milestone can all change which product is right. We keep the manufacturer wording on each product page so you can check before relying on a number.