We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Small clear bottle of paint hardener powder, 3.5 oz

Homax

Homax 3535 Paint Hardener 3.5 oz

SKU CH-113P-EHW6F

Turns leftover latex or acrylic paint into a solid for disposal in 15 to 20 minutes

  • Size3.5 oz
  • Product colorClear
  • Solidifies paint for safe disposal in minutes
  • Treats up to two-thirds of a gallon per packet
  • Works with latex and acrylic paints and stains
  • Mildew-resistant formula protects stored or discarded paint
  • Ready to use after simple stir-and-mix application

Paint Hardener for Latex & Acrylic

Homax 3535 is a clear sodium polyacrylate additive that solidifies leftover latex and acrylic paints or stains for safer disposal. The 3.5 oz container treats up to two-thirds of a gallon and works in both interior and exterior settings. It is intended for homeowners, contractors and DIYers who need to harden unwanted paint before throwing it away.

Simple Stir-In Application

Pour the powder into the paint can and stir until fully mixed; the mixture begins to set in 15 to 20 minutes. Clean-up requires only soap and water while the product is still wet. The main difficulty is judging the exact paint volume so the hardener ratio remains effective.

Handles Two-Thirds of a Gallon Per Bottle

One 3.5 oz unit comfortably solidifies 2/3 gal of compatible latex or acrylic coatings. Larger quantities will require multiple bottles, and oil-based or specialty finishes are not supported by this formulation.

How it compares

Measured against everything we stock in Classroom Supplies & Learning Aids, at today’s prices. Recalculated every night.

Price $3.99
Cheaper than about 99% of the 4,397 comparable items (median $60.99).

Specifications

Product
Brand nameHomax
Product colorClear
Size & build
Size3.5 oz

Questions about this item

How can I tell the paint hardener has finished working after I stir it in?

The mixture will solidify within 15 to 20 minutes, turning the liquid paint into a firm, non-spillable mass that is ready for disposal.

What comes in the package and what else do I need to harden my paint?

The 3.5 oz container of clear hardener is included; you only need the latex or acrylic paint you want to solidify and a stir stick, which are not supplied.

Is the 3.5 oz size enough for the amount of leftover paint I have?

One 3.5 oz bottle treats up to 2/3 gallon of latex or acrylic paint, so choose this size if your leftover volume is at or below that level.

More in Classroom Supplies & Learning Aids

Similar items