Best resin casting powder: water ratio, finish and bag sizes

What the listing offers

• Ratio, demold time and full cure are all stated: 3:1 by weight, 25 to 30 minutes and 2 hours.
• The listing describes a thin, water-like consistency that fills even tiny crevices in a mold.
• Dries to an opaque white and takes pigments, mica, glitter, sand and gold leaf during mixing, per the listing.

Limits to know

• No sealer, pigments or tools are listed, so varnish and colorants are a separate purchase.
• The listing warns that tiny details may break off if a piece is demolded before it has fully cured.

What the listing offers

• Includes the sealer: a gloss varnish comes in the kit, along with 6 water-based acrylic paints.
• Stirrers, cups, measuring tools and gloves are included, so a beginner needs only water and molds.
• The listing gives the full process: 10:3 by weight, stir 2 to 3 minutes, demold in 25 to 30 minutes.

Limits to know

• Full cure is given as a range of 2 to 6 hours, longer than the 2 hours most other listings state.
• The size of the varnish bottle and paints is not stated, so it is unclear how much of the 4500 g they cover.

What the listing offers

• 5000 g in one package suits bulk pours such as sets of trays, planters and candle holders.
• The listing is clear that 3:1 is by weight, not volume, and that water can be adjusted for consistency.
• Described as a fine powder with good bubble release that dries to an opaque white.

Limits to know

• No sealer or pigments are listed, and the cured piece is porous until it is sealed.
• The title says 20 to 30 minutes and the bullets say 25 to 30 for demolding, a small mismatch in the listing.

What the listing offers

• States a 10:3 weight ratio, a 2 minute stir after adding pigment, demold in 25 to 30 minutes and full cure in 2 hours.
• The listing describes the cured surface as smooth and porcelain-like, from a fine, pure white powder.
• A mid-size 2800 g bag; DecorRom also lists a 1400 g bag of the same powder for a smaller first try.

Limits to know

• No sealer, pigments or tools are listed with the bag, so those are separate purchases.
• One bullet says to wait 30 minutes to cure while another gives 2 hours for full cure, so read 30 minutes as demold time.

What the listing offers

• The listing explains how the ratio changes the set: 10:3 cures faster than 3:1, which is faster than 2:1.
• States plainly that the cured piece is porous and not watertight, and recommends a wax, acrylic sealer or varnish.
• A 1000 g bag is a small, low-commitment size for trying casting powder in a few molds.

Limits to know

• At 1000 g it is the smallest size here and will not go far on large trays.
• No pigments, sealer or measuring tools are listed with the bag, so those are separate purchases.

What the listing offers

• The listing gives a 10:3 weight ratio and says to stir until the mix is completely smooth, like yoghurt.
• Described as a fine, pure white powder that cures as smooth as porcelain, for terrazzo and marble style trays.
• Also listed in a 3000 g bag, so the same powder can be bought larger once the small bag is used up.

Limits to know

• No full cure time appears in the listing; it only says the powder cures quickly in 30 minutes.
• No sealer or pigments are listed, and at 1000 g it suits small pieces only.