2UUL RS138 Red Skull Solder Paste for Repair 138℃ 50g

Working on a motherboard where every extra degree of heat risks lifting a pad or cooking a nearby IC calls for a paste that melts fast and clean. The 2UUL RS138 Red Skull Solder Paste solders at 138°C, well below standard leaded pastes, so you get proper wetting on BGA balls and fine-pitch components without pushing heat into parts that can't take it.This paste sits in the RS (Red Skull) line from 2UUL, a brand already known on the repair bench for jigs, board holders, and soldering consumables. The RS138 variant is the lowest-temperature option in that lineup, positioned specifically for boards where standard 183°C or 199°C pastes carry too much thermal risk — think stacked ICs, power management chips, and small SMD components sitting close together on a crowded PCB.In real workshop use, this paste comes into play during IC reattachment after a chip lift, during CPU or NAND reballing, and when tinning pads before placing a new component. Because the melting point sits so low, you can rework the same spot two or three times without the pad lifting off the board — something that happens often with hotter pastes when a technician has to redo a joint. For dead-after-flash boards, hang-on-logo repairs, or a board that came in with a hardware fault after a bad repair attempt elsewhere, a low-temp paste like this gives you more room to fix mistakes without creating new ones.The paste itself flows evenly under a hot air gun or soldering iron, spreading across the pad instead of clumping, which cuts down on cold joints and bridging between neighboring pins. A clean, even spread also means less cleanup afterward — no scraping off excess solder that's ball up unevenly across the pad. Technicians running back-to-back jobs on a busy repair bench notice the difference in how consistently each application behaves compared to generic or unbranded pastes.Because 138°C solder paste is a specialized tool, it's not meant to replace your everyday 183°C paste for general soldering. It earns its place on the bench specifically for heat-sensitive repairs: power ICs, PMIC chips, and components mounted near other parts that already show heat damage or discoloration from a previous repair attempt. Keeping both a standard and a low-temperature paste on hand covers the full range of board-level work that comes through a typical Pakistani repair shop — from routine charging port and display flex work up to full motherboard rework.Storage matters with any paste-flux formula. Keeping the syringe capped tightly and stored at room temperature away from direct heat preserves the flux activity and prevents the paste from drying out before you've used the full 50g. A dried-out or oxidized paste won't flow properly no matter how precise your soldering technique is, so treating it as a consumable with a shelf life — not something to leave open on the bench — gets the most out of every syringe.For a service center running dozens of board repairs a week, having a dedicated low-temperature paste on hand turns what would otherwise be a risky reflow into a controlled, repeatable process. It's a small addition to the toolkit that directly reduces board damage during motherboard-level repair work.