Waterproofing Outdoor Props
October weather is unpredictable. If your props can't handle rain, dew, and humidity, they won't survive the season. Every prop that goes outside needs some level of weather protection. This page covers sealants, protective coatings, and storage strategies.
Sealants and Coatings
- Exterior latex paint — Multiple coats of exterior-grade paint provide basic water resistance. The cheapest option and sufficient for foam props that you'll refresh with paint each year.
- Drylok — Masonry waterproofer. Creates a hard, water-resistant shell over foam. Excellent for tombstones and foam architectural elements.
- Exterior polyurethane — Clear protective coating for painted surfaces. Apply over finished paint jobs for additional water protection.
- Thompson's Water Seal — Spray-on waterproofer for wood props like coffins and pallet fences.
- Flex Seal — Rubber spray coating. Heavy-duty option for areas that take direct water exposure.
Protecting Electronics
Motors, Arduino boards, LED controllers, and wiring need extra protection. See electrical safety for plug and cord waterproofing. For electronics mounted inside props:
- Seal in weatherproof enclosures (plastic containers with sealed lids)
- Conformal coating spray on circuit boards adds moisture resistance
- Dielectric grease on electrical connections prevents corrosion
- Mount electronics where water can't pool or drip onto them
Rain Night Strategy
Have a plan for rain on trick-or-treat night:
- Know which props can stay out in rain and which must come in
- Keep tarps ready to cover sensitive props quickly
- Have a 30-minute teardown plan for electronics and fabric-covered props
- Accept that some years it rains. Protect what you can, enjoy what survives
Storage
See teardown and storage for end-of-season prop care. Off-season storage is the biggest factor in prop longevity. Props stored in a dry garage or attic will last years. Props left in a damp shed will mold and deteriorate.