The 7 Best Filler primers For Fiberglass (2023 reviews)

We consider a filler primer for fiberglass to be a worthy investment in the long run. We are here to help you choose the right one for your purposes from all the best available products in market today.

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Our Top Picks:

Best Overall: Buy: 3M Filler Primer For Fiberglass READ REVIEW

Best For Bare Metal: Buy: Evercoat Great Primer READ REVIEW

Best For Aluminum: Buy: Custom shop Filler Primer For Fiberglass READ REVIEW

Best For aluminium: Buy: Eastwood Filler Primer For Fiberglass READ REVIEW

Best With catalyst: Buy: Evercoat Filler Primer For Fiberglass READ REVIEW

Best For Steel: Buy: Custom shop mix ratio High performance Primer READ REVIEW

Best For Body Filler: Buy: TP Tools Filler Primer For Fiberglass READ REVIEW

Best Overall: 3M Filler Primer For Fiberglass

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Whether you're protecting your hardwood floors from paint splatter or going all out with a decorative mural, rely on scotch delicate surface painter's tape for a professional look that's easy on your surfaces. This tape features edge-lock technology that seals out paint to deliver sharp paint lines and clean removal for your more sensitive projects, including accent walls, decorative stripes and patterns. It's a primer and also a filler.

This aerosol spray primer is sandable in only 30 minutes, making for very fast repairs. The filler primer dries quickly. The idea of the primer is to fill the sanding marks to get smooth enough for finish coat. It is designed to fill surface scratches and create a uniform surface for painting. The primer accepts nearly any automotive quality paint for consistently excellent results.

• High build, fast drying, easy to sand
• Good spray coverage, 11 oz can, affordable, primer plus filler, affordable
• Thin coats at least 5 mins apart are a must
• Applies easily and dries fairly quickly

Best For Bare Metal: Evercoat Great Primer

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate primer. The evercoat great primer is exactly that - it's a simple primer that hits all the right notes. This is the next best thing to coating an entire rough panel in plastic filler. It will pool up, covers the body filler nicely, and sands in a day with 240 grit to prep for paint without clogging too much on an electric da. It is made of fiberglass? If so it will take two gallons or more to do two heavy coats, if it is a metal trailer a less costly acrylic primer ( rust-oleum) will work fine.

The product needs to be stirred thoroughly before use and catalyzed at 2% minimum with the supplied MEKP liquid hardener. It is suitable for dtm, direct to metal application. There are really nice measuring marks on the harder tubes to make mixing small quantities easy.

• Grit sanded painted/bare metal, fills fast, blends well
• Sprays sets and cures nice and hard, and also sandable
• Worked well with even a crappy leaking harbor freight gun

Best For Aluminum: Custom shop Filler Primer For Fiberglass

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The Premium self-etching acid etch primer is a ready-to-spray, self-etching primer with tremendous adhesion and flexibility properties. It improves color holdout, gloss retention and has excellent inter-coat adhesion. It provides excellent adhesion to the following properly prepared substrates. It is ideal for use over bare metals such as aluminum and steel.

This primer works excellent under all major brands of truck bed liner coatings like custom coat, upol raptor, and gator guard. It is fast drying and is sandable after 60 minutes. It is perfect primer for fleet and oem manufacturers.

• Lot of satisfied buyers
• Good brand reputation

Best For aluminium: Eastwood Filler Primer For Fiberglass

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Next on the list, we've got yet another primer that manages to win our hearts. It's the eastwood filler primer for fiberglass and it's widely considered as primer that has the most suitable features. Eastwood's 2k epoxy primer aerosol allows you to paint with the durability and precision of a two-component coating without the paint gun. It comes with an in-house product design, development and testing and a strong track record of high-quality, innovative products. Apply this automotive aerosol gray primer on car body panels, aluminium, steel, or fiberglass to create a durable finish, and to effectively prevent rust.

The Eastwood 2k epoxy gray primer features a 2 component formula containing the premium eastwood gray epoxy paint, and the 2k activator formula. It sprays evenly and has a nice wet edge. It is a must to seal and prime anything before base coat. The innovative nozzle and valve technology, combined with its two internal chambers, ensure the right ratio is mixed every time.

• Most durable aerosol epoxy primer available
• Made in germany using eastwood specialist proprietary technology
• Good brand reputation

Best With catalyst: Evercoat Filler Primer For Fiberglass

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The evercoat filler primer for fiberglass gives the top-tier primer a run for their money by offering flagship specs at a much more affordable price. This stuff goes on like top-coat and builds to a thick, smooth finish. It sprays on thick, sinks into welds and really dries nicely. The frame is solid however it has moderate pitting in some areas due to corrosion and a generally rough surface after being sand blasted.

The product is very easy to mix and spray just follow instructions and you will have great results. It's unbelievably easy to spray with a 2.0 tip. It is compatible with waterborne paint and voc.

• Good filler for light scratching and sands well
• Sprays good, covers well fills and block sands nicely
• Takes little bit of practice for diy guy

Best For Steel: Custom shop mix ratio High performance Primer

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Next on the list, we've got yet another primer that manages to win our hearts. It's the custom shop mix ratio high performance primer and it's widely considered as one of the best convenient primer you can buy. It offers superior adhesion to bare metal, steel, bare aluminum, fiberglass, gelcoat, body fillers and many properly prepared rigid plastics and sanded oem finishes. It offers superior sanding characteristics and excellent topcoat gloss holdout. It is compatible with and can be top coated with most automotive paint brands like custom shop, restoration shop, ppg, house of kolor, valspar, etc.

The formulation contains a rich blend of anti-corrosive additives to achieve maximum defense against rust and corrosion while adding the benefit of outstanding adhesion. It is easy to use with a 1.4 -1.5 tip with a splash of reducer this is very good. It is available in primer gray with 1-1/4 quart and 1-1/4 gallon kits available.

• Fills scratches great flows evenly sands easy great primer 5 stars
• Great for automotive and industrial applications
• Good investment for long term

Best For Body Filler: TP Tools Filler Primer For Fiberglass

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate primer. The tp tools filler primer for fiberglass is exactly that - it's a simple primer that hits all the right notes. Sprayable filler primer surfacer offers excellent fill and build capabilities. It can provide single-coat coverage for most applications. It is required when painting and also offers excellent fill and build capabilities. You can use it to level imperfections, fill sand scratches and pinholes, and as a sealer over body filler and repairs. It is fast drying and sands easy making this the ideal product for daily use.

• Respiratory protection is required when painting
• Excellent adhesion to properly prepared metal, galvanized metal, fiberglass, smc, aluminum, and body fillers
• One of the new comers and featured product