Which sealant resists jet fuel?
Dymonic 100 has a manufacturer statement of jet fuel resistance. Confirm the exposure conditions before you specify it.
Which fuel grade, how long in contact, and tested by what method? The supplied data sheet doesn't say. Tremco describes Dymonic 100 as jet fuel-resistant, which puts this polyurethane sealant on your shortlist, but get Tremco to confirm it's suitable for your joint before you buy.
A spill you'll clean up and fuel left against the joint need separate checks. Make clear to Tremco which could happen on your job. Just asking whether the sealant resists fuel doesn't give them that detail.
Start with the fuel exposure
Could fuel reach the bead occasionally, or would contact happen repeatedly? Tell Tremco, along with the fuel name or specification and how long it could remain there. They'll also need details of the joint itself. Give them both surfaces, the width and depth, expected movement and temperatures.
Don't take approval for water immersion as approval for standing fuel. Tremco lists Dymonic 100 as suitable for water immersion, but the sheet doesn't say the same for jet fuel immersion. If your joint will stay submerged, ask Tremco about that condition directly.
Check the whole joint before ordering
Match your joint to the uses Tremco lists for Dymonic 100 before you choose it. Expansion and control joints, precast concrete panel joints, and perimeter caulking are among them. Dymonic 100 is a single-component, non-sag polyurethane construction sealant, but a listed joint type alone doesn't clear it for every job where fuel could reach the bead.
The supplied sheet doesn't tell you how long to let the sealant cure before fuel exposure. Get that cure period and the supporting fuel-resistance information from Tremco. Have them confirm that the sealant suits your fuel, substrates and pattern of contact, plus how to prepare the surfaces, whether primer is needed and how to design the joint.
Don’t schedule fuel contact from tack-free time
The physical-properties table gives a tack-free time of 6 to 8 hours at 23°C and 50% relative humidity. That’s a tack-free result, not a stated waiting period before jet fuel exposure.
Check your working temperature before you put the job on the schedule. The sheet lists an application range of 4°C to 37°C; below 4°C, it sends you to Tremco's cold-temperature application bulletin. Working outside the listed range means getting Tremco's instructions first.
What to send with your product enquiry
Review the [Dymonic 100 product details](/dymonic-100/), then send Cranco the fuel specification, exposure pattern, joint dimensions, both substrates and planned application temperature. Ask for Tremco’s confirmation of the exposure and cure requirements before you order for that use.