Professional All-Purpose Reducer for Poly-Glass Topcoats | NAPCO Ltd
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All Purpose Reducer Thinner

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All Purpose Reducer Thinner

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The Professional's Choice for Flawless Finishes 

When you're working on tubs, tiles, and surrounds, there’s no room for error. NAPCO’s All-Purpose Thinner is specifically engineered for professional tub and tile refinishers who demand consistent, high-quality results on every job.

Eliminate guesswork and callbacks with the one thinner that works perfectly with all your NAPCO polyurethane topcoats. This premium all-purpose thinner is precision-engineered to deliver consistent, professional results every time. With its medium-speed evaporation formula, you'll achieve maximum gloss and eliminate common finishing problems that cost you time, money, and callbacks.

Stop guessing and start finishing with confidence. Trust the thinner formulated for the unique demands of tub and tile refinishing professionals.

Don’t let the wrong thinner wreck your perfect finish. Choose NAPCO’s All-Purpose Thinner—trusted by pros, formulated for performance.

Pro Tip: Working in cold weather? Switch to our Fast Reducer for best results.

 

Availability:In stock
SKU STC.MED.THINNER

The Professional's Choice for Flawless Finishes 

When you're working on tubs, tiles, and surrounds, there’s no room for error. NAPCO’s All-Purpose Thinner is specifically engineered for professional tub and tile refinishers who demand consistent, high-quality results on every job.

Eliminate guesswork and callbacks with the one thinner that works perfectly with all your NAPCO polyurethane topcoats. This premium all-purpose thinner is precision-engineered to deliver consistent, professional results every time. With its medium-speed evaporation formula, you'll achieve maximum gloss and eliminate common finishing problems that cost you time, money, and callbacks.

Stop guessing and start finishing with confidence. Trust the thinner formulated for the unique demands of tub and tile refinishing professionals.

Don’t let the wrong thinner wreck your perfect finish. Choose NAPCO’s All-Purpose Thinner—trusted by pros, formulated for performance.

Pro Tip: Working in cold weather? Switch to our Fast Reducer for best results.

 

Frequently Bought With

***ALL Polyglass 320 Resins NOW USE Universal Catalyst and All-Purpose Reducer/Thinner!!*** One thinner for All polyurethane topcoats. It's a no-brainer.

This workhorse thinner is specially formulated for product compatibility and optimum performance. It is a blend of extra pure thinners, this medium speed formula will help provide high quality and maximum gloss when used to reduce (thin) all NAPCO Poly-Glass brand topcoats and Epoxy Primers.

The chemical components of the thinners you use is critical to your success. Use one that allows the solvent to evaporate too quickly and the coating can "skin over" before the solvent below has a chance to evaporate, causing solvent popping. This can be a major cause of callbacks, costing you time and money. Rapid evaporation can be a killer as well. condensation can form on the surface, resulting in blushing. That's bad. If a solvent evaporates too slowly, you run the risk of surface runs and sags that can ruin the look of the resurfaced fixture.

That's a lot to take in. Just trust us on this one. If you use this thinner, your jobs have a better chance of turning out brilliantly, reducing your stress level. One thing to note though: in cold conditions you might want to use our Fast Thinner. It usually yields better results in colder conditions.

Application:
For the average size bathtub (35 square foot surface), mix 10 oz. of PolyGlass resin with 5 oz. of the Universal Catalyst (by volume). Thin with 5 oz. of the All-Purpose Reducer to spray apply. Spray 1 light tack coat followed by 2 wet coats. Pause between coats to inspect the work. Allow the coating to “tack’ before applying the next coat. At 75F and 50% humidity, PolyGlass resin will dry to touch in 8-15 minutes. Remove masking paper and apply caulk in 30-45 minutes after the last coat is applied.


Notes and Precautions:
Refer to the MSDS sheet before use. The NAPCO PolyGlass Resin should be shaken constantly for 20-40 seconds before use. For a 35-square foot tub, mix 10-oz of PolyGlass Resin, with 5 oz. of Catalyst and 5 oz. of All Purpose or Fast Reducer.
All components should be stored indoors between 50-90 F. Shelf-life in unopened containers is one year from the date of manufacture. The catalyst is particularly sensitive to high humidity, so the catalyst container must be kept closed at all times when not in use. The viscosity of the resin will more than double at 50F vs. 75F (perhaps requiring more reducer for proper spray, which further lengthens the recoat tack times as well as slowing down the cure). If the components are stored at high temperatures, (90F and above), the viscosity of the base will noticeably be lowered, and the solvents in the mixed paint will evaporate more rapidly, causing too fast a “dry” and may result in a lower gloss and powdery finish. The shorter pot-life at high temperatures could lead to drastically shortened working time and could even gel in the paint pot.

– This item is compliant to California’s 2020 VOC Regulations. Click Here for a list of California areas that must be VOC compliant.

More Information
Weight 1.000000

What is NAPCO’s All-Purpose Reducer designed for?

NAPCO’s All-Purpose Reducer is specifically engineered for professional tub, tile, and surround refinishing. It is formulated to work seamlessly with all NAPCO Poly-Glass polyurethane topcoats and compatible primers to ensure consistent film formation and high-gloss performance.

Can I use this reducer with any coating system?

This reducer is optimized for use with NAPCO Poly-Glass topcoats and our high build primer. While it may be chemically compatible with other systems, it is precision-formulated to deliver ideal evaporation rates and finish quality within the NAPCO refinishing system.

What makes this reducer different from generic paint thinner?

Generic thinners are not engineered for refinishing performance. NAPCO’s All-Purpose Reducer features a precision-blended mix of extra-pure aromatic solvents designed to control evaporation speed. This helps prevent solvent pop, blushing, runs, and surface defects that often lead to costly callbacks.

What evaporation speed is this reducer?

This product uses a medium-speed evaporation formula. It performs well in most spring, summer, and fall conditions and is ideal for controlled, predictable film formation in standard refinishing environments.

What if I’m refinishing in colder temperatures?

For colder working conditions, NAPCO recommends switching to the Fast Reducer to maintain proper flow and curing performance.

Will this reducer help improve gloss and leveling?

Yes. The balanced evaporation rate promotes optimal flow-out and film formation, helping achieve maximum gloss, clarity, and smooth leveling across tubs, tile, and surrounds.

Does this reducer help reduce callbacks?

When used properly within the NAPCO system, it helps minimize common refinishing failures such as solvent pop, blushing, and sagging. Fewer finish defects mean fewer corrections and fewer callbacks.

Is this reducer VOC compliant?

Yes. This item complies with California’s 2020 VOC regulations in applicable areas. Refer to the compliance listing for specific regional requirements.

What sizes are available?

NAPCO’s All-Purpose Reducer is available in Quart and Gallon sizes to match your job volume needs.

Where can I find application and safety information?

Please download the Technical Data Sheet (TDS) and Safety Data Sheet (SDS) for detailed information on proper mixing ratios, application procedures, storage guidelines, and safety specifications.

 

Watch Our Video: Reducer for Refinishing - How to Mix

 

 

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