Speedokote Super Fill SS-2790 High Build Primer - Fast Dry

In this review the Speedokote SS-2790G/SS-2790A Super Fill High Build Primer is evaluated for bodyshops and serious DIYers who need a fast, easy-to-sand 2K urethane primer with real filling power. The bottom line: it is best for users who want a high build, true 2K primer that sands well and holds color and gloss for subsequent topcoats. The kit's easy 4:1 mix and fast dry time make prep work more efficient, while the medium gray base helps reveal low spots during block sanding.

Key Features

• High build and fill: The primer lays down thick coats that fill minor imperfections and blend feathered edges to reduce block sanding time.
• True 2K urethane: As a two-component system it provides durable adhesion and a solid foundation for urethane topcoats.
• Easy 4:1 mix: The simple mixing ratio saves time and reduces measuring errors on the job.
• Fast dry and sands great: Quick drying means you can scuff and sand sooner, improving workflow in busy shops.
• Medium gray color: The gray base balances hiding and contrast so low spots are visible without over-darkening.
• Great adhesion: Designed to bond well to typical automotive substrates and previous sealers.

Who It's For

Speedokote SS-2790 is geared toward collision repair technicians, professional painters and advanced DIYers who need a high-build primer that sands smoothly and supports quick turnaround. The product suits projects where filling 80 grit scratches and feathered panels is common and a robust urethane foundation is desired.

Users who want a very thin guide coat or who prefer a sprayable single-stage primer for cosmetic-only work might look elsewhere; this kit is tailored to those who will take advantage of its true 2K chemistry, higher build and sanding characteristics.

Pros & Cons

Pros

• High build formula reduces multiple wet coats and saves time when filling low areas.
• Easy 4:1 mixing and fast dry speed streamlines prep in busy shops.
• Sands easily to a smooth surface and holds color and gloss for consistent topcoat results.
• Works well with common spray setups, including 1.8 mm tips, for uniform application.

Cons

• Thickness can be perceived as very thick by some users, which may require slight thinning or adjusted spray technique.
• Not intended as a single-stage finish; requires proper topcoat for final color and gloss.

Specifications

Product name	SS-2790G/SS-2790A Super Fill High Build Primer gallon kit
Brand	Speedokote
Mix ratio	Easy 4:1 mix
Type	True 2K urethane primer
Color	Medium gray
Key properties	Super high build, fast dry, sands great, great adhesion

Our Verdict

The Speedokote SS-2790 Super Fill primer is a solid choice for professionals and competent DIYers who need a fast-drying, high-build 2K urethane that sands well and fills imperfections. Its easy 4:1 mix, strong adhesion and medium gray base make it good value where speed and finish quality matter most.

Frequently Asked Questions

Is this a true 2K primer?
Yes. The SS-2790 is a true 2K urethane primer requiring a hardener for proper cure and durability.

How is the sanding performance?
Customers report it sands very well and can fill 80 grit scratches effectively, so block sanding is straightforward.

Does it spray easily?
Many users find it sprays smoothly, including with 1.8 mm tips, though the thickness may require slight thinning or technique adjustments.