Hey there! If you’re like me, you love working on cars and trucks in your garage or driveway, but sometimes the weather just doesn’t cooperate. That’s where tarps come in handy, and I’ve spent plenty of time figuring out which ones hold up best. One question I kept asking myself was, “What is the thickest mil tarp?” After years of using tarps to cover vehicles, create temporary shelters, and protect my tools, I’ve learned a ton about tarp thickness and what it means for automotive projects.
In this guide, I’m sharing everything I’ve discovered about the thickest mil tarps, why they matter, and how to choose the right one for your needs. Whether you’re a weekend DIYer or a pro mechanic, this article will help you find the perfect tarp. Let’s dive in!
Understanding Tarp Thickness and Mil
When I first started shopping for tarps, the term “mil” confused me. A mil is one-thousandth of an inch, so a 10-mil tarp is 0.010 inches thick. The higher the mil, the thicker and usually more durable the tarp. I’ve used tarps ranging from flimsy 5-mil ones to heavy-duty 20-mil beasts, and the difference is huge. Thicker tarps are tougher, resist tears better, and hold up in harsh weather. For automotive use, like covering a car or setting up a paint booth, thickness matters because it affects how well the tarp protects your vehicle or workspace. Knowing the MIL rating helps you pick a tarp that won’t let you down.
What is the Thickest MIL tarp Available?
After digging through hardware stores, online retailers, and even talking to suppliers, I found that the thickest mil tarps for general use are around 20 to 22 mils. Some specialized vinyl tarps can go up to 40 mils, but those are rare and usually overkill for most automotive tasks. A 20-mil tarp is what I’d call the sweet spot for heavy-duty jobs—it’s thick enough to withstand wind, rain, and debris but still manageable to handle. I’ve used a 20-mil vinyl tarp to cover my classic Mustang during a winter storm, and it held up like a champ. Anything thicker, like 40 mils, is more for industrial or construction use, not your typical garage setup.
Types of Tarps and Their Thickness
Not all tarps are created equal, and I’ve tried a bunch to see what works best for automotive projects. Here’s a table of common tarp types and their typical mil ratings:
| Tarp Type | Material | Typical Mil Range | Best For |
|---|---|---|---|
| Polyethylene (Poly) | Plastic | 5-20 mils | Affordable, lightweight, temporary covers |
| Vinyl | Vinyl | 10-40 mils | Waterproof, durable, vehicle protection |
| Canvas | Cotton/Poly Blend | 10-20 mils | Breathable, long-lasting, garage use |
| Mesh | Poly with Mesh Weave | 8-12 mils | Breathable, long-lasting, for garage use |
Poly tarps are the most common and cheapest, but they tear easily at lower mils. Vinyl is my go-to for waterproofing, especially at 18-20 mils. Canvas is great for breathability, which I use when covering a car long-term to prevent mold. Mesh tarps are perfect for shade without trapping heat, like when I’m working under a carport.
Why Thickness Matters for Automotive Use
When I started using tarps, I grabbed a cheap 6-mil poly tarp from a big-box store. Big mistake—it tore after one windy day! Thicker tarps, like 16-20 mils, are a game-changer for automotive work. They stand up to sharp tools, falling branches, and heavy rain. I’ve used a 20-mil vinyl tarp to create a temporary paint booth in my driveway, and it kept overspray contained without ripping. Thicker tarps also last longer, saving you money over time. For protecting a car during storage or shielding your workspace from dust, a higher mil tarp is worth the investment.
Choosing the Right MIL Tarp for Your Project
Picking the right tarp depends on what you’re doing. Here’s how I choose based on my projects:
- Vehicle Storage: To cover my truck in the driveway, I use an 18-20 mil vinyl tarp. It’s waterproof and tough enough to handle snow and UV rays.
- Temporary Shelter: When working outdoors, I go for a 16-mil poly or vinyl tarp to block rain or sun. It’s thick but easy to hang.
- Paint Booth: A 20-mil vinyl tarp is my choice for enclosing a painting area—it’s durable and keeps paint contained.
- Shade or Airflow: For hot days under my carport, I use a 10-12 mil mesh tarp to let air through while blocking sun.
I always measure my space first to get the right size. A tarp that’s too small won’t protect well, and one that’s too big is hard to manage. I also check for grommets (those metal rings) to make hanging easier.
How to Use a Thick Mil Tarp for Automotive Projects
I’ve used thick tarps in all sorts of ways, and here’s my step-by-step process to make them work like a charm:
Step 1: Measure and Plan
I start by measuring the area I need to cover, like my car or workspace. I use a measuring tape to get the length and width, adding a few extra feet for overlap. If I’m hanging the tarp, I note the height too. Planning helps me buy the right size and avoid wasting money.
Step 2: Choose the Tarp
Based on the job, I pick a tarp with the right mil thickness. For example, I used a 20-mil vinyl tarp to cover my Jeep during a hailstorm. I make sure it has grommets for easy tying. If it doesn’t, I add them with a grommet kit from the hardware store.
Step 3: Set Up the Tarp
For vehicle coverage, I drape the tarp over the car and secure it with bungee cords through the grommets. I tie the cords to the wheels or nearby anchors to keep it tight. For a shelter, I hang the tarp from a frame or rope, using zip ties or clips. I make sure it’s taut to avoid flapping.
Step 4: Secure and Adjust
Wind is the enemy of tarps, so I double-check that everything’s secure. I add weights, like sandbags, to the bottom corners if it’s touching the ground. For hanging tarps, I use extra bungees to keep it stable. I test it by giving it a gentle tug to ensure it won’t budge.
Step 5: Maintain the Tarp
After use, I clean the tarp with soap and water to remove grease or dirt. I store it folded in a dry place to prevent mold. For vinyl tarps, I avoid extreme cold, as they can crack. Regular care keeps my tarps ready for the next job.
Benefits of Using Thick Mil Tarps
I’ve come to love thick mil tarps for their durability and versatility. Here are the benefits I’ve noticed:
- Durability: A 20-mil tarp can handle rough weather and sharp objects without tearing. I’ve had one last years in my garage.
- Waterproofing: Vinyl tarps at 18-20 mils keep water out, perfect for protecting cars or tools during rain.
- UV Resistance: Thicker tarps often have UV protection, which I’ve found essential for long-term vehicle storage.
- Versatility: I’ve used thick tarps for everything from covering my motorcycle to creating a windbreak for welding.
The extra thickness gives me confidence that my stuff is safe, no matter the conditions.
Drawbacks of Thick Mil Tarps
Thick tarps aren’t perfect, and I’ve run into a few challenges. They’re heavier than thin ones, which makes them harder to hang or move. My 20-mil vinyl tarp takes two people to drape over a car properly. They’re also more expensive—a good 20-mil tarp can cost $50-$100, compared to $10 for a 6-mil one. Finally, thick tarps can trap heat or moisture if not vented, which I learned when mold formed under a canvas tarp covering my boat. I now make sure to use breathable materials or leave gaps for air when needed.
Where to Buy Thick Mil Tarps
I’ve shopped around a lot for tarps, and here are my go-to spots:
- Hardware Stores: Places like Home Depot or Lowe’s carry 10-20 mil poly and vinyl tarps. I check their heavy-duty sections.
- Online Retailers: Amazon and TarpsPlus have a wide range, including 20-mil vinyl tarps. I read reviews to ensure quality.
- Specialty Suppliers: Sites like TarpsNow or Chicago Canvas offer thick vinyl tarps up to 40 mils for specific needs.
- Local Farm Stores: I’ve found great canvas tarps at tractor supply stores, perfect for breathable covers.
I always compare prices and check for UV resistance and grommet spacing. Buying local lets me inspect the tarp before paying.
Tips for Getting the Most Out of Thick Mil Tarps
Here are some tricks I’ve learned to make thick tarps work better:
- Add Grommets: If your tarp lacks enough grommets, I use a kit to add more for secure tying.
- Use Bungee Cords: They’re better than rope for flexibility in wind. I keep a stash in my garage.
- Clean Regularly: Grease and dirt can weaken tarps. I wash mine after every big project.
- Store Properly: I fold my tarps and store them in a dry shed to avoid mold or cracking.
These tips have saved me from replacing tarps too soon and made my setups more reliable.
Common Mistakes to Avoid
I’ve made plenty of tarp mistakes, so let me help you skip them. First, don’t buy a tarp that’s too thin for the job—6-mil tarps won’t last outdoors. I learned this when a cheap tarp shredded during a storm. Second, don’t skimp on securing the tarp. Loose ties lead to flapping and tears. Third, avoid using non-breathable tarps for long-term vehicle storage without ventilation—mold is a pain to clean. Finally, measure twice before buying. I once got a tarp too small for my truck, and it was useless.
Comparing Thick Mil Tarps to Other Options
I’ve tried other protective options, like car covers or plastic sheeting, but thick mil tarps are my favorite. Car covers are tailored but expensive and not as versatile. A good 20-mil tarp can cover a car, a workbench, or a whole garage area. Plastic sheeting is cheap but flimsy—I’ve had 6-mil sheeting tear under light wind. Tarps are also easier to secure and reuse than custom covers. For automotive work, the durability and flexibility of a thick tarp make it hard to beat.
Why I Love Thick Mil Tarps
There’s something satisfying about a tarp that can take a beating and still protect my gear. I’ve used thick tarps to save my projects from rain, sun, and even hail, and they’ve never let me down. They’re affordable, easy to set up, and last for years with a little care. Whether I’m covering my car or building a temporary shelter, a 20-mil tarp gives me peace of mind. It’s a simple tool that makes a big difference, and I love sharing that with other automotive enthusiasts.
Conclusion
Figuring out what is the thickest mil tarp has been a journey, but it’s helped me protect my vehicles and workspace like a pro. From 20-mil vinyl tarps for heavy-duty protection to 16-mil poly tarps for versatile use, thick tarps are a must-have for any automotive project. I’ve shared my process for choosing, using, and maintaining them, so you can get the most out of your tarp.
Whether you’re shielding your car from a storm or setting up a paint booth, a thick mil tarp is your best friend. Grab one, secure it well, and enjoy the peace of mind it brings. If you’ve got questions, check out the FAQs below. Happy wrenching!
FAQs
What is the thickest mil tarp I can buy?
The thickest tarps for general use are 20-22 mils. Vinyl tarps can go up to 40 mils, but those are for specialized jobs.
Are thick tarps waterproof?
Vinyl tarps at 18-20 mils are fully waterproof. Canvas tarps are water-resistant but may need treatment for full protection.
How do I know what mil tarp I need?
For vehicle storage, I use 18-20 mils. For temporary shelters, 16 mils works. Lighter tasks can use 10-12 mils.
Can thick tarps tear?
They’re tough, but sharp objects or strong winds can tear them. I secure mine tightly and avoid dragging them over rough surfaces.
Where’s the best place to buy thick tarps?
I check Home Depot, Amazon, or TarpsNow. Local farm stores are great for canvas tarps.
How do I clean a thick tarp?
I use soap, water, and a soft brush. For vinyl, I avoid harsh chemicals to prevent cracking.
Can I use a thick tarp for long-term vehicle storage?
Yes, but I choose a breathable canvas tarp or add ventilation to prevent mold under vinyl.