General Finishes Enduro Extender Clear Pint

Extender, 16 oz bottle

When a water-based finish starts to set before it has leveled, you see lap lines, brush marks and streaks. General Finishes Extender is a slow-drying solvent made to fix that: added to any GF water-based product, it lengthens dry time and lowers viscosity, which GF says helps when finishing large areas or working somewhere warm or dry. GF also highly recommends it with Glaze Effects. Use it only in water-based products, never oil-based. A pint treats a lot of finish: at the 5% starting rate that is about 1.5 oz per quart, so 16 oz handles roughly ten quarts.

Ship time: Orders usually ship in 2 to 4 business days, then standard delivery takes 3 to 7 business days, so plan on about 1 to 2 weeks. $5.99 shipping, free at $35+ (lower 48 + DC). Shipping policy

$5.99 shipping, free at $35+, no code needed (lower 48 + DC). 30-day returns on unused, unopened items; opened paint, aerosols and flammable liquids can't be returned (refund policy).

Dosing chart (GF TDS)

VOC-regulated areas

Extender itself is listed at 1.025 kg/L on the TDS, so adding it raises the VOC of the finish. GF says it may be used in regulated areas only as long as the finished mix stays under the legal limit for that product. In California, more than 2% added to High Performance makes it non-compliant with SCAQMD rules.

Other uses and handling

• Dampen a cloth or paper towel with Extender to lift freshly applied, dry Glaze Effects.
• Store above 50 F and below 80 F, tightly sealed; best within a year of the can date, and unopened stock can conservatively last up to 5 years.
• Wash hands with soap and water; clean equipment with GF Brush & Gun Cleaner. Don't pour leftovers down the drain.
• The opposite problem, finish drying too slowly in cool or humid air, is what GF Accelerator is for.

Need less? There is a 4 oz bottle. Pair it with Glaze Effects or the High Performance topcoat.

Manufacturer part number: EXPT

Questions

How much Extender do I add? The GF technical data sheet says to start at 5% by volume, about 1.5 oz per quart, stir thoroughly, and add more if needed without going past 15% by volume, about 5 oz per quart. For High Performance, GF's directions use 10 to 15% where local rules allow.

When is it worth adding Extender? GF recommends it for large areas and for warm or dry conditions. For High Performance specifically, GF suggests adding 10% when the room is above 80 F or below 70% humidity, to help brush strokes level out.

Does Extender shorten the shelf life of my finish? No. The TDS says Extender does not affect the shelf life of a product it has been added to. Store it between 50 and 80 F out of direct sun with the cap tight.

Extender facts: the General Finishes Extender page, the GF Extender technical data sheet (March 2020), the General Finishes High Performance page and GF's brush-stroke FAQ. Shop all General Finishes.

Free standard shipping on orders $35+ to the lower 48 states and DC.

30-day returns on unused, unopened items. Contact us within 30 days of delivery to start a return. Opened paint, aerosols, flammables, special orders and sale items can't be returned. Read the full refund policy.