10 Best Radiator Sealers - Updated June 2021

8,859 Reviews Scanned And Analyzed

Rank	Product Name	Score	Check Price
1	J-B Weld 2120 Radiator and Plastic Repair Kit J-B	9.9 Score	View Product
2	Bar's Leaks 1194 Grey Radiator Stop Leak - 6 oz. Bar's	9.6 Score	View Product
3	J-B Weld DS-114 PERM-O-Seal Radiator Stop Leak - 4 oz J-B	9.3 Score	View Product
4	Irontite All Weather Seal, Blue, 16 oz (468-9130-16) Irontite	8.9 Score	View Product
5	K&W Permanent Metallic Block Seal Head Gasket Repair, 16 Wt Oz K&W	8.6 Score	View Product
6	Zerex ZXC03 Super Radiator Sealer, 14.5 Ounce Zerex	8.3 Score	View Product
7	AlumAseal ASBPI12 Radiator Stop Leak Powder Blister Card - 20 g AlumAseal	8.2 Score	View Product
8	AlumAseal ASBPI12-12PK Radiator Sealer Blister Card, (Pack of 12) AlumAseal	7.7 Score	View Product
9	Motor Medic by Gunk C312 Radiator Sealer and Stop Leak - 11 oz. Motor	7.5 Score	View Product
10	Prestone AS148 Super Radiator Stop Leak - 11 oz. Prestone	7.4 Score	View Product

Mark Walker 19 October 2019

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J-B Weld 2120 Radiator and Plastic Repair Kit J-B

9.9

Score

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Top Customer Reviews: J-B Weld 2120 ...

Rating: 5 out of 5 with 1 ratings

5 / 5 Keturah

This product has done really well and has taken my motorcycle behind in a street in the functional state.

3		J-B Weld DS-114 PERM-O-Seal Radiator Stop Leak - 4 oz J-B	9.3 Score	View Product

J-B Weld DS-114 PERM-O-Seal Radiator Stop Leak - 4 oz J-B

9.3

Score

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Top Customer Reviews: J-B Weld DS-114 ...

Rating: 4 out of 5 with 1 ratings

4 / 5 Kareem

Fact well in a past , maintains in my truck partorisca a amergency

4		Irontite All Weather Seal, Blue, 16 oz (468-9130-16) Irontite	8.9 Score	View Product

Irontite All Weather Seal, Blue, 16 oz (468-9130-16) Irontite

8.9

Score

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Top Customer Reviews: Irontite All ...

Rating: 5 out of 5 with 1 ratings

5 / 5 Codi

I have used this partorisca take coolant taking to a faced sleves of a cylinder. HE hasent done also very first 5 hours was in a manufatures recomendations of 1 boat extracted 6 chevrons. I have used 3 chevrons like this has used them the half bounce it, He didnt do like this has used them a rest of a boot and has been announces 5 hours. Light improvment but I belive a blockade is in need of the plenary reconstructs.