Item #860009

Alexseal Finish Primer 442

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                  Image of : Alexseal Finish Primer 442 Alexseal Finish Primer 442 Item # 860009


                  Alexseal® Finish Primer 442 is an epoxy-based finish primer that provides an optimum base for the final topcoat. Thanks to an advanced formula that features fast buildup during application, the Finish Primer 442 offers advanced adhesion qualities over various substrates and a non-porous surface that sands extremely well.


                  • Special characteristics ensure a reduction of cleaning and maintenance
                  • Preserves your boats appearance and value
                  • Designed to prime and seal old and new, properly prepared stable surfaces such as gelcoat and fiberglass
                  • Provides advanced adhesion qualities over various substrates, exceptional sanding characteristics, mechanical resistances and good film build
                  • Enhances the "Wet Look" of Alexseal's Topcoats
                  • May be used above or below the waterline


                  • Spray Mixing Ratio: 1:1:1/2 (6-25%)
                  • Brush Mixing Ratio: 1:1:1/2 up to 1 (0-25%)
                  • Base: P4420 (W) P4423 (G)
                  • Converter Number: C4427
                  • Accelerator: A4429
                  • Reducer: R4042 R5015
                  • Theoretical coverage: 6.2 m 2/liter / 23.5 m 2/gallon / 253 sq. ft./gallon
                  • Practical coverage:
                    • Conventional air spray equipment: 2.9 m 2/liter / 11.2 m 2/gallon / 120 sq. ft./gallon
                    • HVLP air spray equipment: 3.3 m 2/liter / 12.5 m 2/gallon / 134 sq. ft./gallon
                    • Brush / roller: 5.5 m 2/liter / 20.9 m 2/gallon / 225 sq. ft./gallon
                  • Number of coats: 2-3
                  • Practical coverage per gallon: 120 sq. ft./11.2 m 2 @ 3-4 mils/500 microns
                  • TD Drying Time at 77°: TD 18 hours
                  • FC Drying Time at 77°: 14 days
                  • Minimum recoat time at 77° (by itself): 1 hour
                  • Minimum recoat time at 77° (other product): 12 hours
                  • Maximum recoat time at 77°: 24 hours


                  • Substrate pre-treatment: The substrate must be clean, dry and free from dust, grease, oil and other contamination. Fiberglass and gel coat should be coated directly with ALEXSEAL Finish Primer 442 after sanding with P100 - P150 grit. Refit and repair: Old coatings must have good adhesion and chemical resistance and must be sanded with P100 - P150 grit. A compatibility test should be performed if the old coating is questionable. Steel and Aluminum should initially be coated with ALEXSEAL Protective Primer 161. Fairing Systems. ALEXSEAL Finish Primer 442 should be applied over ALEXSEAL Super Build 302 after block sanding with P100 - P180 grit.
                  • Application by spray & brush: Apply 2 or 3 coats to a wet film thickness (WFT) of 100 - 200 microns (4 - 8 mils) per coat. This will achieve a dry film thickness (DFT) of 50 (2 mils) for a 2 coat application. Maximum recommended film thickness during a spray application is 3 coats totaling 300 microns (12 mils) WFT, or 100 microns (4 mils) DFT.

                  Technical Data Sheet

                  Mixing Chart

                  Safety Data Sheet

                  Part Numbers for Alexseal Finish Primer 442

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                  Can I spray the topcoat x over this primer? And if I can how long I have to wait??

                  Asked by: Nico
                  I suggest that you reread the product information instructions, it is clearly spelled out. If you ask this then you haven’t read or understood the instructions. 
                  Answered by: Nordicww
                  Date published: 2024-04-24
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