Crack Sealant Buying FAQ: Melting Temperature, Crack Width and Shelf Life
2026.10.29
Road contractors buying hot-pour crack sealant usually ask the same practical questions. Here are the answers overseas buyers ask us most often.
1. What melting and application temperature do I need?
Most hot-pour bituminous sealants melt and are heated in a kettle to about 180-200 C. They should be applied within the manufacturer's recommended temperature range - too hot breaks down the rubber polymer, too cold makes the seal stiff and unworkable. Always use a thermostatic melter and a thermometer.
2. Which crack widths can it seal?
Hot-pour sealant is designed for working cracks roughly 3-25 mm wide. Narrow hairline cracks are usually too thin to fill properly; wide, spalled cracks need routing/cleaning and sometimes a backing rod before sealing.
3. How long does a sealed crack last?
A well-prepared, properly filled crack in a moderate climate lasts 3-5 years. Life drops sharply if the crack was not cleaned and dried, or if the sealant was overheated.
4. Do I need routing before pouring?
For active, working cracks, routing (creating a reservoir) gives the sealant room to stretch with movement and greatly improves bond. For fine, static cracks, clean-and-pour is often enough.
5. What about cold-applied sealants?
Cold-pour and emulsion-based sealants need no kettle and suit small jobs and low temperatures, but they cure slower and generally have shorter service life than hot-pour polymer products.
Quick buying checklist
| Question | What to confirm |
|---|---|
| Climate | Cold-flexibility grade for your winter low |
| Crack size | 3-25 mm working cracks ideal |
| Equipment | Thermostatic melter + pour pot |
| Prep | Blow out debris, dry the crack |
Tell us your local winter temperature and typical crack width, and we will recommend the right grade of hot-pour sealant and packaging (carton or bulk).
