Gaunt Industries HYPO-49 & HYPO-65 Underglaze & Mixed Media Applicator Set of 2 - Ceramic Slip Trailer Set - Clay Art Decorating Kit Review (2026)

Who reaches for a hypodermic-style applicator

This set is built for potters who decorate greenware or bisque with slip trailing, fine underglaze lines, or raised surface texture rather than broad brushwork. The two included bottles cover different jobs: one with an 18 gauge needle for the HYPO-49 style fine work, and one with a 16 gauge needle for the HYPO-65 style medium lines. Because each bottle only holds about 2 ounces, this kit suits detail work and sample tiles more than covering large platters in trailed slip. Beginners drawn to mishima style inlay, dot patterns, or raised outlines around underglaze fields will get the most from it, while production potters filling large batches of the same design may eventually want more bottles so they are not stopping mid-piece to flush and refill a single applicator.

What is actually in the box

Each applicator is a clear LDPE Boston round bottle holding about 2 ounces, fitted with a stainless steel blunt needle tip rather than a soft rubber nose. The HYPO-49 bottle uses an 18 gauge needle for the finest lines, and the HYPO-65 bottle steps up to a 16 gauge needle, listed at roughly .065 inch outer diameter and .047 inch inner diameter, for slightly heavier trails. Both needles are removable and threaded onto the bottle cap, which is what lets the tips be swapped, cleared, or replaced with finer or coarser gauges sold separately by the maker. The bottles themselves are plastic, not glass, so they tolerate being squeezed repeatedly without cracking, and the clear body lets you see how much slip or underglaze is left before a refill.

Getting consistent lines day to day

Slip and underglaze need to be thinned to a smooth, lump-free consistency before loading these bottles, since the needle openings are narrow enough that any grit or partially dissolved clay will clog mid-line. Straining your mix through a fine sieve before filling saves frustration. Between colors or after a session, flush each needle and bottle with water right away, since dried slip inside a metal tip is far harder to clear than dried slip in a wider trailer. The manufacturer also sells replacement needles and cleaning wires separately, which is worth knowing if a tip gets bent or a clog will not budge. With only two bottles, potters working in three or four colors will want extra applicators or a rinse cup close by to keep switching fast.

How it stacks up against other trailers

Compared with the Frienda 3 Sets Slip Trailer Bottle kit, which ships with 24 assorted needles and three bottles across multiple sizes, this Gaunt Industries set is narrower in scope but arguably more precise for its two gauges, since the needles are purpose-built rather than a mixed assortment. Larger multi-bottle kits like the Dandat 34-piece set trade some of that precision for sheer bottle count, letting you dedicate one applicator per color without constant cleaning. If your work leans toward fine, repeatable line weight rather than juggling many colors at once, the two-bottle focus here is a feature, not a limitation, though it does mean budgeting for a second set sooner if your palette grows.

Bottom line

This is a solid pick for potters who want dependable, metal-tipped control over slip trailing and fine underglaze work and do not mind rinsing between colors. The two gauges cover a useful range from delicate outlines to slightly bolder trails, and the plastic bottles hold up to regular squeezing. Shoppers doing multi-color trailing on every piece, or who dislike stopping to clean needles mid-project, should look at larger multi-bottle kits like the Frienda or Dandat sets instead, since more bottles mean less interruption. For focused detail work, sample tiles, and mishima style inlay, this set earns its place on the glazing table.

Frequently asked questions