What is the difference between this and Holt's Radweld?

According to Holts, SEALIT is stronger then Radweld.

Will this help if water pump seal has slight leak?

doubtful, but worth a try. Will seal a leaking water pump gasket, but a seal with a rotating shaft is unlikely..but at the price of Sealit, worth a try. Changing a water pump for new can be difficult , it all depends on access. If you do put a new one in, refill the system with coolant very slowly so there are no air locks and use any bleed scres there may be. If you get a lot of air locks , the new water pump seal can burn out and leak too, when you start up

If expansion tank looks empty, should i put coolant in it before using this?

turn on heaters to hot open all vents to circulate water in system get there air out Put it all in and top up to max with antifreeze winters here then take your car for a drive helps to maintain excelleration. it worked on my 5 series BMW 2014 had lost half a pint since using this have not lost a drop done over 200 miles only check when completely cold.

Oil in coolant system

Yes sounds like head gasket issue use this product it will form a seal as a temporary fix for approximately 3 months . Many thanks

Holts Sealit Leak Repair 250ml Packing May Vary

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚗 Seal it, forget it—drive leak-free with confidence!

CORROSION DEFENSE - Protects your engine’s internals from rust and wear while sealing leaks.
INSTANT ENGINE RESCUE - Pour and go formula fixes leaks in minutes—no downtime, no hassle.
EFFORTLESS APPLICATION - One-step, no special timing or tools needed—just pour and drive with confidence.
PROFESSIONAL GRADE SEAL - Trusted by mechanics for a permanent, clog-free repair that lasts thousands of miles.
UNIVERSAL COMPATIBILITY - Works seamlessly with all car engines and cooling systems—one solution for every ride.

Holts SEALit Leak Repair is a professional-grade, multifunctional sealant designed to permanently fix leaks in all car engines and cooling systems. Its unique pour-and-go formula acts quickly without clogging, providing corrosion protection and lasting results verified by thousands of miles of trouble-free driving.

Specifications

ASIN	B00EJOI4P6
Best Sellers Rank	13,365 in Automotive ( See Top 100 in Automotive ) 148 in Fillers, Adhesives & Sealants
Brand	Holts
Customer Reviews	4.2 4.2 out of 5 stars (808)
Date First Available	14 Aug. 2013
Item Weight	290 g
Item model number	LOYHREP0101A
Manufacturer	HOLTS
Manufacturer part number	LOYHREP0101A
Model	LOYHREP0101A
Package Dimensions	14.5 x 7.5 x 3.6 cm; 290 g
Position	Rear Left Upper

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