M35 flux paste: solder that flows instead of balling up

On a console board that's twenty or thirty years old, solder often refuses to take: the pad is oxidised, the tip slides, the joint stays dull and domed. A dab of flux applied before the iron chemically cleans the area during heating, and the solder flows on its own. It's the basic consumable for micro-soldering: ribbon cables, connectors, capacitors, IPS screens.

What it does

• Cleans during heating: dissolves the oxide layer on pads and pins, which lets the solder wet the surface instead of rolling into a ball.
• Fine component work: rework of SMD, QFP, FFC/FPC connectors and BGA balls, with an iron or a hot air station.
• Three pack sizes: a single unit for a one-off job, a pack of 2 if you repair regularly, a pack of 5 for a workshop or a group purchase.
• Declared RoHS compliant by the supplier, with no substance of very high concern stated.

What it doesn't do

• This is not solder. Flux prepares the surface but adds no metal: you also need solder wire or solder paste.
• This is not glue. It doesn't hold anything mechanically and won't fix a torn trace, a lifted pad or a dead component.
• The supplier provides no volume, no datasheet and no activation temperature. The variant indicates a number of units, not a guaranteed weight — we won't make one up.
• The nature of the residue left after heating isn't documented. Treat it as a flux that needs cleaning and go over the area with isopropyl alcohol.
• No console, iron or tool is supplied with this consumable.

Compatibility

No model restrictions: it's a workshop consumable, not a spare part. It can be used on any printed circuit board — home console and handheld console motherboards, screen ribbon cables, battery connectors, USB-C ports, controller and arcade stick PCBs. However, it isn't intended for plumbing or jewellery soldering, nor for aluminium or stainless steel, which require dedicated fluxes.

Skill level required

Intermediate: this product assumes you already solder. You need a fine-tip iron with adjustable temperature (or a hot air station for BGA), solder, desoldering braid and isopropyl alcohol with a brush for the final clean. Apply a very small amount — any excess spreads under neighbouring components and makes cleaning harder. Work in a ventilated area: flux fumes should not be inhaled.

In the box

• 1, 2 or 5 units of M35 flux paste, depending on the variant chosen.

Listing verified on 19 August 2026.

Delivery in 10 to 18 days · ships within 3 to 5 days · 2-year legal guarantee · 14-day returns.