
Dave R.
"Spray-foamed every gap for three seasons. Still found damage every April. Switched to Fugelyn last fall — one placement before lockup. Opened in spring to nothing."
Class C owner, IowaYou sealed the gaps. You spray-foamed the entry points. You did exactly what every forum said to do. Here is why mice got in anyway — and the one thing that actually stops them.

You spray-foamed the entry points. You sealed every gap you could find. You stuffed steel wool in the exhaust. You did the full inspection — crawled underneath, probed with your fingers, checked the wheel wells.
You drove away from that storage facility in November feeling like you had actually handled it this time. Then you opened the door in April.
The damage wasn't at the entry points you sealed. It was behind the furnace. In the wall cavity beside the slideout. In the wiring along the rear cabin. Six months of damage built invisibly in exactly the spaces you thought you had protected.
This is the part nobody talks about. You didn't fail. The method failed. Sealing and spray-foam address the gaps you can see. They do nothing about the ones mice find after the rig settles, flexes, and contracts through five months of winter temperature changes.
The RV you sealed in November is not the same structure in January. The gaps that didn't exist when you were looking exist now. And mice need a space the width of a dime to get through.
RVs are not houses. They flex. They expand and contract through winter temperature cycles. The foam you pressed into a gap in November has a different shape by January — because the vehicle around it has moved.
Slideout seams shift under cold-weather pressure. Utility penetrations settle. The steel wool you stuffed in the exhaust compresses and leaves space.
The only solution that doesn't depend on a specific gap being closed is one that makes the entire space unappealing to enter — regardless of how many gaps there are.

Mice don't inspect your rig once and move on. They return. Repeatedly. Every night during storage season they approach the same vehicle, testing the same entry points, looking for the gap that wasn't there last week.
You sealed it once. They check it every night.
The rig you sealed in November is on their route by December. By the time you open in April, they haven't just been in once. They've been in all winter.

Most RV owners who've been burned by sealing try repellent pouches next. They place them throughout the interior, feel better about it, and drive away. Then they come back to find droppings on top of the pouch.
Here is what most owners never find out: the fill material inside most competitor pouches is corn cob. Corn cob is a food source. It is also nesting material.
Fugelyn uses a mineral fill carrier. Mineral fill is inert. It has no food signal. It has no nesting value. It carries one message only — the continuous scent barrier — with nothing competing against it.

Sealing works entry-point by entry-point. A scent barrier works on the entire perimeter at once.
Mice assess every space they consider entering by smell before they attempt entry. A space that registers consistent threat signals is a space they mark as dangerous and avoid.
The operative word is continuous. Fugelyn's mineral fill releases the essential oil blend at a consistent concentration from day one to day 90.

Fugelyn costs $0.37 a day. First order is buy one get one free.

The damage is the invoice. The thing that doesn't appear on the invoice is what happened between November and April.
The owners who placed Fugelyn describe the spring opening differently. Not relief from discovering nothing went wrong. Settled. The way things feel when what you prepared for worked exactly the way it was supposed to.



"Spray-foamed every gap for three seasons. Still found damage every April. Switched to Fugelyn last fall — one placement before lockup. Opened in spring to nothing."
Class C owner, Iowa
"I found droppings on top of the Fresh Cab pouches. ON TOP OF THEM. Switched to Fugelyn after reading about the mineral fill. Clean opening two seasons in a row."
Fifth Wheel owner, Minnesota
"First year I sealed everything I could find. Got hit. Second year I added peppermint spray. Got hit again. Third year I added Fugelyn. Nothing."
Travel Trailer owner, Wisconsin
"My neighbor spray-foamed his rig the same day I placed Fugelyn in mine. Same lot. Same winter. One difference."
Fifth Wheel owner, ColoradoSealing helps — and you should keep doing it. But RVs flex through winter temperature cycles. A gap you sealed in November has a different shape in January. Fugelyn covers the entry points that open after you leave.
Peppermint spray fades within seven days of application. Fugelyn's mineral fill releases continuously for 90 days at a consistent concentration.
Most competitor pouches use corn cob as the carrier material. Fugelyn uses mineral fill: inert, no food signal, no nesting value.
Many policies exclude rodent damage, especially for vehicles in storage three months or longer. Confirm with your specific policy before assuming coverage.
Plant-based formula — peppermint oil, clove oil, cedarwood oil, cinnamon oil. No poison, no rodenticide, no chemicals.
Travel trailers and fifth wheels: 4–6 pouches. Class C and Class A motorhomes: 6–8 pouches. If storing a tow vehicle as well, add 2–3 pouches. Full placement guide included free.
90-day money-back guarantee. Test it for the entire storage season — if it doesn't work, you get your money back.