CARTMAN 20x40 ft Blue Poly Tarp 5 Mil Thick - Multipurpose Protective

In this review of the CARTMAN 20x40 ft Blue Poly Tarp, the bottom line is straightforward: it is a budget-minded, versatile protective cover for short-term outdoor use, best for people who need a large, exact-size tarp quickly. The tarp's single biggest selling point is that the marked size is the exact finished size, so buyers can plan coverage without guessing excess material. For campers, homeowners covering furniture, or boat owners needing temporary protection, this tarp delivers a practical solution with clearly reinforced edges and frequent grommets.

Key Features

• Finished Size: The listed dimensions are the exact finished size so users get predictable coverage without trimming or guessing extra material.
• Dustproof & Waterproof: Designed to resist dust and light water exposure, it keeps gear and furniture protected during short-term outdoor storage.
• Heat-Sealed & Reinforced: The four sides are heat-sealed and folded with internal nylon rope reinforcement to reduce tearing from edge stress.
• Convenient Grommets: Metal grommets every 36 in make it straightforward to tie down or lash to frames, racks, and poles for secure setup.
• Corner Protection: Plastic corner reinforcements add durability where strain is highest and improve the tarp's appearance when in use.
• Economical and Lightweight: At 5 mil thickness it is lightweight and affordable, making it a good choice for temporary covers and multi-use tasks.

Who It's For

This tarp suits homeowners who need to cover winterized furniture, gardeners protecting mulch or firewood, and campers or tent users looking for an inexpensive ground or shelter cover. Its exact finished size and regular grommet spacing make planning and installation simple for DIY tasks and quick protection jobs.

It is less well suited to long-term permanent installations or heavy-duty industrial use where thicker, UV-rated materials are required. Buyers needing guaranteed long-term waterproofing and maximum tear resistance should consider heavier-duty alternatives.

Pros & Cons

Pros

• Exact finished size eliminates guesswork when covering specific items.
• Reinforced, heat-sealed edges and corner pieces reduce seam failure under normal use.
• Metal grommets every 36 in make securing the tarp fast and reliable for short-term jobs.
• Lightweight and affordable, offering good value for seasonal or temporary coverage.

Cons

• At 5 mil the tarp is not intended for long-term heavy-duty exposure and some users report mixed durability under heavy strain or prolonged wet conditions.
• Waterproofing performance varies with conditions; it is best treated as a short-term cover rather than a permanent weatherproof solution.

Specifications

Brand	CARTMAN
Finished Size	20 ft x 40 ft
Material Thickness	5 mil
Water Resistance	Dustproof and waterproof design for short-term use
Edge Construction	Heat-sealed, folded edges with internal nylon rope
Grommet Spacing	Metal grommets every 36 in
Corner Reinforcement	Plastic corner pieces

Our Verdict

The CARTMAN 20x40 ft Blue Poly Tarp is a practical, economical choice for short-term protection of furniture, firewood, boats, or camping gear where an exact finished size and easy tie-downs matter. It delivers clear value for seasonal or occasional use thanks to reinforced edges and regular grommets, but those needing long-term heavy-duty waterproofing or maximum tear resistance should upgrade to a heavier tarp.

Frequently Asked Questions

Is this tarp truly the stated size?
Yes, the product lists the finished size as exact, so a 20 ft x 40 ft tarp will measure very close to those dimensions.

Can it be used year-round outdoors?
It is designed for short-term outdoor protection; prolonged, year-round exposure in harsh conditions may reduce lifespan compared with heavier, UV-rated tarps.

How often are the grommets placed?
Metal grommets are placed every 36 in, which simplifies securing and tying the tarp down.