Pettit Sandless Primer
Pettit Z-Spar Pettit
  • Pettit Sandless Primer

Pettit Sandless Primer

Pettit 6999 Sandless Primer is a pre-treatment primer designed to adhere tenaciously to unsanded fiberglass gelcoat. When properly topcoated with antifouling paint, the primer and antifouling paint will bond together, resulting in a finish with excellent overall adhesion.

Use Sandless Primer over vinylester gelcoats, where sanding gelcoat may void osmotic blister warranties. It maybe used over conventional gelcoats as well, and as a tie coat between two part epoxy primers and antifouling paints.

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Tech Spec Product Info User Generated Content


  • Eliminates the need to sand before applying antifouling paint.
  • Recommended over vinyl ester and other blister resistant gelcoats where sanding is forbidden.
  • Longer 'tacky time' for improved recoatability.


APPLICATION INFORMATION Surface preparation in a no sand antifouling system is of critical importance. All surfaces to be painted, regardless of age, should be scrubbed with detergent and water and then rinsed thoroughly. Failure to properly prepare the surface will result in flaking and peeling of the primer and/or antifouling paint. Shake or stir the 6999 Sandless Primer thoroughly. Apply one thin, continuous coat by brush or short nap roller only. Do not spray. Monitor the drying of the 6999 Sandless Primer carefully. The dry times listed here are only estimates. Humidity, ventilation, film thickness, as well as temperature can all affect the rate at which the 6999 Sandless Primer cures. Read and understand the application and topcoating instructions on the reverse side carefully before applying the 6999 Sandless Primer. For larger boats, or on hot, humid days, it may be advisable to section the boat and apply the primer and antifouling to each section rather than the whole boat at once.

SURFACE PREPARATION The surface to be painted must be scrubbed thoroughly with a detergent and water solution and then rinsed completely with fresh, clean water. Then using Pettit 15095 Fiberglass Dewaxer and plenty of clean rags, wet the surface to be painted with a rag wetted with the Dewaxer and wipe clean with a dry rag. Continue in this manner until the entire surface has been dewaxed. Check the surface for residual wax or mold release by running water over the surface. If the water beads up or separates, repeat the dewaxing process until all traces of wax, mold release and other contaminants are removed and water sheets off the surface. Always dewax Vinyl Ester surfaces at least three times prior to using 6999 Sandless Primer.

Mixing: Shake or stir the 6999 Sandless Primer thoroughly before using. Make sure any pigment settled to the bottom of the can during storage has been properly remixed into suspension. Thinning is not necessary or recommended.

Estimated Dry Times: Counting the minutes or hours after the 6999 Sandless Primer has been applied is not nearly as important as actually checking the paint film to determine when the Sandless Primer is ready for topcoating with antifouling paint. To check the Sandless Primer, touch it with your fingertip using moderate pressure. If it feels wet or you get paint transfer to your fingertip, it is still too wet to topcoat. Depending on the Pettit antifouling paint that will be used, the 6999 Sandless Primer must dry set-to-touch or tack-free before topcoating (see Topcoating instructions). The primer has dried set-to touch when it feels tacky when touched with a fingertip using moderate pressure. No paint should come off the surface onto your finger. The primer has dried tack-free when no surface tackiness is felt when applying moderate pressure with a fingertip. Use the chart below to estimate the drying times of the Sandless Primer. Remember, this guide is only an estimate. Humidity, ventilation, film thickness, as well as temperature can all affect the rate at which the Sandless Primer dries. Therefore, wide variation from the estimated dry times shown below can occur.

        Drying Time Table

Time to recoat with all Anitfoulings except Ablatives  Time to Recoat with Ablatives 
Temperature Range  Set-to-touch  Tack-free 
50 - 65 degrees F  2 hours  4 hours 
65 - 80 degrees F  1 hour  3 hours 
80 - 95 degrees F  1/2 hour  2 hours 
Below Water Line (yes/no): Yes
BRAND: Pettit Z-Spar
Number Of Parts: One Part
Type: Fiberglass Primer
5.0 1

Messy, but works great


This primer does its job very well. It is also incredibly hard to get off your hands. So, wear gloves when using it.


Chippewa Falls, WI


Pettit Sandless Primer



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