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Polyethylene vs Polyurethane vs PVC Tarps: Best for Boat Covers (2026)
Protecting a boat requires the right material—waterproofing, UV resistance and breathability matter most. This guide compares three Trademark Supplies polyethylene tarps to help boat owners choose the best fit in 2026. You'll learn how polyethylene stacks up to polyurethane and PVC for boat covers, how these three specific tarps differ by size, durability and features, and which one to buy for your use case. Products were selected based on size options, reinforced construction details in the listing, and customer feedback on quality, fit and durability.
Quick Answer
For most boat owners the Trademark Supplies Large Waterproof Tarp (20' x 20', ASIN B07D9THDNX) is the best balance of waterproofing and UV resistance. If you need the cheapest long tarp choose the 12' x 25' Budget Pick (ASIN B07FWV98X4); pick the 12' x 20' two-pack (ASIN B07FWCNSQ8) when you want two covers or spare pieces.
Our Top Picks
Quick Comparison
Select 2-3 products to compare side-by-side
| Compare | Product | HandleSmith Score | Price Tier | Key Feature | Best For | Action |
|---|---|---|---|---|---|---|
20x20 Poly Tarp
|
Premium | Extra thick, reinforced hem with rope | Wide-beam boats & general heavy coverage | Check Price | ||
12x25 Poly Tarp
|
Budget | Long length for narrow/long boats | Narrow boats, trailers and budget builds | Check Price | ||
12x20 2-Pack
|
Premium | Two-piece set for redundancy or spares | Owners needing two covers or backup pieces | Check Price |
1. Large Waterproof Tarp - Heavy Duty 5 Mil Thick Poly Tarpaulin Ideal for Canopy Tents, Boats, RV or Pool Covers - Multipurpose Protective Tarps with Grommets for Indoor and Outdoor Use | 20' x 20'
A roomy, reinforced polyethylene tarp built to block rain and UV with rust-proof grommets and a rope-reinforced hem. Customers praise its coverage and waterproof performance; some report mixed durability when used under heavy abrasion or sharp edges. Best when you need broad, reliable coverage and easy tie-down points.
Key Specs
- Material: Polyethylene (plastic) tarpaulin
- Thickness: 5 mil
- Grommets: Rust-proof grommets every 36"
- Reinforcement: Rope in hem for rip resistance
Pros
- Better waterproofing and coverage than the 12' x 25' option due to 20' width
- Stronger tie-down reinforcement than the 2-pack's standard edges
- Consistently praised for size and function by many users
Cons
- Durability is debated—some customers report rips under heavy stress
- Heavier and less packable than thinner budget tarps
Best For: Wide-beam boats & general heavy coverage
Check Latest Price on Amazon2. Large Waterproof Tarp - Heavy Duty 5 Mil Thick Poly Tarpaulin Ideal for Canopy Tents, Boats, RV or Pool Covers - Multipurpose Protective Tarps with Grommets for Indoor and Outdoor Use | 12' x 25'
The budget long-sheet polyethylene tarp gives excellent length for narrow hulls and trailers while keeping costs low. It shares the same 5 mil material and rust-proof grommets; buyers like the value and fit but some report mixed sturdiness and occasional tearing under heavy use.
Key Specs
- Material: Polyethylene tarpaulin
- Thickness: 5 mil
- Grommets: Rust-proof grommets every 36"
- Reinforcement: Hem with rope for edge strength
Pros
- Better value for lengthy coverage than the single 20' x 20' for long narrow boats
- Lighter and easier to handle than the heavier 20' x 20'
- Strong waterproofing and UV protection relative to its price tier
Cons
- Mixed reports on sturdiness—can tear more easily than heavier tarps
- Thickness debated by users; not ideal for abrasive contact without backing
Best For: Narrow boats, trailers and budget builds
Check Latest Price on Amazon3. Large Waterproof Tarp - Heavy Duty 5 Mil Thick Poly Tarpaulin Ideal for Canopy Tents, Boats, RV or Pool Covers - Multipurpose Protective Tarps with Grommets for Indoor, Outdoor Use | 12' x 20' 2 Pack
Two matching polyethylene tarps provide flexibility—use one as a cover and one for spare or partitioning. They include reinforced hems and rust-proof grommets like the other models. Customers like the value of two pieces but note thickness and long-term durability can vary with heavy exposure.
Key Specs
- Material: Polyethylene tarpaulin
- Thickness: 5 mil
- Pack: Two tarps, each 12' x 20'
- Grommets: Rust-proof grommets every 36"
Pros
- Better value per tarp than buying two single pieces separately
- Provides redundancy—use one as a spare or to cover gear separately
- Same waterproof and UV treatment as single-piece Tarps
Cons
- Not as wide as the 20' x 20' for broad-beam boats
- Durability concerns similar to other 5 mil polyethylene tarps under harsh conditions
Best For: Owners needing two covers or backup pieces
Check Latest Price on AmazonWhich One Should You Choose?
If you want the safest, simplest recommendation: buy the 20' x 20' (ASIN B07D9THDNX) if your boat needs wide coverage and strong tie-down points — it balances waterproofing and reinforced edges best. If budget matters and your hull is long and narrow, the 12' x 25' Budget Pick (ASIN B07FWV98X4) gives the most length for the money. If you need two covers—either to spare one for replacements or to cover gear separately—choose the 12' x 20' 2-pack (ASIN B07FWCNSQ8). In all cases, add breathable vents or prop the tarp off the hull to reduce moisture trapping; consider upgrading to a PVC or PU-coated cover if you need multi-year outdoor storage and top UV/abrasion resistance.
Best for Specific Scenarios
- Short-term seasonal storage: 12' x 25' (B07FWV98X4) because it’s the most budget-friendly long tarp.
- Wide-beam or pontoon boats: 20' x 20' (B07D9THDNX) because the 20' width covers more beam and offers stronger hem reinforcement.
- Two-boat households or backup needs: 12' x 20' 2-Pack (B07FWCNSQ8) because you get two usable pieces for covers, backups or gear protection.
Frequently Asked Questions
Are polyethylene tarps waterproof enough to use as boat covers?
Yes—polyethylene tarps are highly waterproof and block rain effectively. For long-term outdoor storage, combine them with ventilation and careful placement to avoid trapped moisture; for multi-year exposure consider thicker PU or PVC-coated covers for better abrasion and UV durability.
How do I stop moisture from getting trapped under a tarp?
Create airflow by using breathable vents or propping the tarp off the hull with support poles so air can circulate. Avoid laying tarps directly against fittings or cabin openings and check under the cover periodically to let condensation dry.
How important are grommets and reinforced hems?
Very important—grommets allow secure tie-downs and reinforced hems (rope or double-fold) reduce tear risk at attachment points. All three reviewed tarps include rust-proof grommets every 36" and rope-reinforced hems to help secure the cover.
How We Selected These Products
Our recommendations are based on data-driven analysis: we evaluated 100770+ products across 13951+ brands using a composite scoring system that weighs rating (40%), review volume (30%), price value (20%), and demand signals (10%). Every product is ranked by data, not opinions.
Last updated: May 24, 2026
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HandleSmith Score is our editorial ranking based on a composite analysis of product quality, value, and verified customer sentiment. Click through to Amazon for current pricing, availability, and live customer reviews.