The 5 Best White Seam sealers (2023 reviews)

The por15 white seam sealer is long-lasting, rigid and fits well with your regular usage like a dream. It will work well for your application. It will stop rust because it creates a waterproof, airtight bond to the rusted surface. It will adhere well and hold up for many seasons. It is good for filling small holes like burn through when welding. It is best to replace the break line and not use any chemical to try to seal a leak. It will stick to stone because it creates a waterproof, airtight bond to the rusted surface. It takes a couple days or more to harden if applied heavy.

Why We Like This:

Very easy to apply and cures very easily
Best for areas where you can just leave as it is spread
Thoroughly rinse degreaser off with fresh water
Indespensable for a permanent rock hard seam/seal

Best For RV: 3M Seam Sealer

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For a low asking price, 3m seam sealer has managed to overwhelm their customers by packing as many features as they could. If you are ordering multiple at a time chances are that most will come with tips. It can be used on vehicle seams-designed to be painted. It will fill seams and it won’t hurt the fiberglass. Once open it doesn't have the longest shelf life.

This is easy to apply and leaves a nice finish sealing up welds. The sealer should be top coated when exposed to ultra violet rays. It will fill some large gaps with ease and holds up incredibly well. It is easy to tool after laying a bead if you want.

Why We Like This:

Provides and excellent direct paint surface that's ready to go quickly
Good stuff, has many other uses besides seams on vehicles
Good brand reputation

Best For Fiberglass: custom shop White Seam Sealer

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The custom shop white seam sealer's superior materials makes sure that it ages well with use. These products are high quality elastomeric sealants formulated to provide excellent adhesion to a wide variety of substrates and come in an easy to use, non-sag consistency suitable for easy application with a standard caulking gun in both horizontal and vertical automotive joints. It is fast curing and designed exclusively for automotive uses.

It is a one part, high performance sealant that combines high flexibility with high ultimate strength, permanent bonds and long service life. It is worked great at sealing the moulding. The product goes on very easily and when dry, provides a water tight seal. It can be used on automotive panels.

Why We Like This:

Spreads well and easy to apply
Easy to use and easy to remove
Cured quickly even in cold temperatures
Fills smoothly and dries while staying flexible

Best For filling voids: 3M White Seam Sealer

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate sealer. The 3m white seam sealer is exactly that - it's a simple sealer that hits all the right notes. The Heavy-Bodied Seam Sealer is a two-part seam sealer for all general purpose automotive sealing needs that cures quickly to a tough, strong bead for lasting seam sealing protection. It allows easy tooling for matching oem seam sealer appearances. This sealer flows out smooth and sets up in a few minutes. It is great for filling voids, due to low viscosity and high stickiness.

The seam sealer cartridge should be all that you need for your project when it shows up. It sets in six minutes, but really, you have more than three to get the masking tape off. A small bead flattens and slicks nicely with a single light stroke of the acid brush. If you wait more than 1-2 minutes, between using it, it will set up in the mixing tip and you will have to replace it with a new one.

Why We Like This:

Dries quickly so you can paint same day
Flows great down drip rails on cars and trucks
Turn into absolute rust buckets if stored outside

Best With All automotive topcoat systems: Polyvance White Seam Sealer

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The polyvance white seam sealer gives the top-tier sealer a run for their money by offering flagship specs at a much more affordable price. Polyvance's all seasons waterborne sealer is a satin, freeze-tolerant waterborne sealer for finishing primed oem and aftermarket plastic bumpers, and raw polyurethane bumpers. From black to white, the ALL SEASONS Sealer can be sprayed right out of the can or mixed to any shade of gray required for basecoat color matching. Because it is designed to be sprayed over questionable waterborne primers used on aftermarket bumpers, you can have the confidence that the sealer will provide a durable barrier coat for any basecoat paint.

It will not lift if exposed to water after completely dried. It is packaged in a 1 gallon (3.8 l) round paint can. It is compatible with all automotive topcoat systems and dries quickly to a smooth basecoat-ready finish.

Why We Like This:

Good investment for long term
Lot of satisfied buyers