Mr. Hobby Mr. Cement SP Super Power Plastic Cement Review (2026)

Who this fast cement is built for

Mr. Cement SP, sold under product code MC131, is aimed at builders working with plastic kits, Gundam and other scale models included, who keep running into parts that spring apart or refuse to sit flush during assembly. Its faster grab compared with standard cements makes it useful specifically for those stubborn joints rather than as the only glue on a build. Builders who value maximum working time to fine-tune a part's position before it locks should treat this as the second step in a joint rather than the first, since its speed works against careful adjustment once the parts touch.

What is in the bottle and how it behaves

It ships in a 40 ml bottle as a clear liquid brush-on cement, with the brush built into the cap so no separate applicator is needed. Mr. Hobby describes the formula's drying speed as dramatically improved over earlier pour-on style cements, paired with adhesive strength that holds up on parts under tension. A black-tinted version, Mr. Cement SPB, exists in the same line for builders who want the glue itself to help hide a seam, though this clear SP version is meant to dry without adding color to the joint.

Using it without losing control of a joint

Mr. Hobby's own guidance is to use Mr. Cement SP alongside the slower Mr. Cement S, applying the standard cement first while you fine-tune a part's fit, then brushing on SP once the position is exactly right to lock it in place quickly. Applied on its own to a joint, brush a thin line into the gap between already-aligned parts rather than loading up the brush, since a heavy application spreads the fast-setting cement further than intended. As with any solvent cement, work in a ventilated space and keep the brush cap sealed tightly between uses so the bottle does not dry out or thicken.

Trade-offs against other plastic cements

Tamiya's Extra Thin Cement is the more common default for straightforward styrene seams, since it wicks into a tight joint by capillary action and gives a bit more working time than SP's fast grab. Plastruct's Plastic Weld is a heavier duty option built for scratch-building with ABS and acrylic sheet rather than kit assembly. Mr. Cement SP's niche is specifically the stubborn joint: a part that keeps springing open or a panel that will not sit flush long enough for a slower cement to grab, which is where its speed becomes an advantage rather than a liability. Keeping both a slower cement and this faster one on the bench covers most situations a styrene kit can throw at a builder without forcing a single glue to do every job well, and swapping between the two as a build progresses is a common workflow rather than a compromise.

Verdict and who should reach for something slower

For builders who keep a slower cement on the bench for general assembly and want a second, faster option for problem joints, Mr. Cement SP fills that role well. Anyone assembling a kit start to finish with careful positioning at every step will find its speed works against them more often than not, and should lean on Mr. Cement S or Tamiya Extra Thin as the primary glue instead, saving SP for the handful of parts that genuinely need it. Think of it as a specialist tool for the last few stubborn joints on a build rather than the one bottle that handles the whole kit from sprue to finished model.

Frequently asked questions