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EPS Surfboard Blank Sealer Paste

Regular price $ 10.15

EPS Surfboard Blank Sealer Paste

Easily fills bead tear-outs in EPS blanks for a bright white, smooth surface which can be painted on with acrylic paints prior to glassing. 

(1) 16 oz. container will seal a surfboard up to 7'0" long

2.5 Quart bucket of sealing paste also available for sealing multiple boards.

USE: Mix this sealing paste with 1 oz bottled or distilled water (not tap water - the minerals will turn it yellow) into a whipped cream like consistency. 1 oz measuring cup included with sealing paste.

Squeegee the sealer mixture in a thin layer over the entire blank to fill any holes. Let dry and lightly sand with 220 grit to smooth out. 
On the rails it's easier to just cake the sealer on with your hands and sand it to the the rail shape rather than squeegeeing it on the rail section by section.



Ask a Question
  • Do I really need to spackle and EPS blank?

    You should spackle the board if it's going to be a clear glass job, tinting the resin, or painting the blank (No need to spackle if doing an opaque pigment lamination). Due to the nature of EPS foam there are always small cavities between the beads and spackle fills them in for a clean and bright white looking surface. You can screen the blank with sanding screen up to 220 grit to close the cavities as small as possible but it's more work. Spackling is fast and easy. I personally leave my EPS boards screened with Sandshark Sanding Screen and spackle them. It's all the same in the end with a lot less elbow grease...

  • Do you need to seal a PU Surfboard blank

    EPS Surfboard Blank Sealer Paste is used on EPS boards to fill in any voids due to bead tearout.  You do not need to do this step to a PU blank unless needed.

  • How much time does it take to dry enough so that i can flip the board ?

    Greenlight Surf Supply Eps Surfboard Blank Sealing Paste will dry in 30- 45 minutes depending on the conditions.

  • Is this safe to handle without gloves before it hardens?

    EPS Surfboard Blank Sealer Paste is safe to handle without gloves.

  • I used this spackle to seal a board but tried to cover a messed up pencil line with white acrylic paint and it turned yellow. Could it be an issue with compounds in the paint and I just need to use a new paint?

    This sounds like a reaction between the paint that was used and the EPS Surfboard Blank Sealer Paste.

  • Even though its labeled as EPS could I still use it on XPS?

    Yes, you can seal XPS foam with this paste as well

  • If you are going to paint the board before then doing a clear glassing, is there a certain type of paint you need to use? I believe if you were to paint the EPS foam directly, you need to use a water based acrylic paint - is this same type of paint required to paint the spackle as well to be safe?

    When paintong an EPS blank if it is sealed or on the raw foam you will always want to use water based acrylic paints.

  • Hi, is this the same as micro balloons or is it closer to spackle? I've read that when store bought spackle will delaminate after a few years - will this product have the same result?

    The EPS Foam Sealing Paste is not micro-ballons or spackle, it is a light weight slurry of organic, white compounds that allows resin to penetrate into the foam.

  • Hi, quick question with the spackle and resin tints. Will the spackle absorb more of the tint? I want a nice even color, and I'm concerned that I'll get darker spots where there is spackle. Thanks!

    Spackle provides a nice even white canvas so the tint will be same color all over the board. There are no dark or light spots when properly sealing the blank with spackle

  • Hello, Im just wondering how to use the spackle. Do I mix it with water? If so, whats the ratio? Do I apply it with a squeegee like resin and do I need to it sand after applying it? Thanks for any info you can can give me.

    From our Surfboard Buidling Guide:

    Sealing the EPS blank is optional but we recommend it to make your board look great while eliminating a lot of fine sanding and screening. This smoothes out any holes, provides a nice white surface for artwork, and seals up the pores of the blank so it doesn’t absorb too much resin when you are glassing. Our Engineered EPS doesn’t need to be sealed as it will not have as much bead tear out as other EPS foams, but if you want a clean looking white board, painting the blank, or tinting the resin, here’s how: Use a bag of our EPS Surfboard Sealing Spackle (one bag will seal a board up to ~7'0" long). It is bright white and light, so is the preferred spackle for sealing EPS blanks. Scoop a hunk of spackle into a mixing cup, and add a little bit of bottled or distilled water (NOT TAP WATER - the minerals in tap water will turn the spackle yellow) to the mix to turn the spackle into a whipped cream consistency. Pour this water/spackle mixture over your blank and spread it around smoothly and thinly over the surface of your blank with an epoxy spreader.  Scrape off the excess spackle back into your mixing bucket, as you can re-use it for the other side of your board. If you have any small dings or chunks missing from the blank (common in the stringer area), you can fill these holes with the spackle. The idea is to just fill the small voids in the foam and not put a thick later on the board. Scraping the spackle off with the epoxy spreader will take all the excess off and leave just what is needed in the holes.  You can apply the spackle to the rails with your hands and just glob it on since your hand can conform to the rail shape easily. Then follow with the epoxy spreader to clean it up. Allow the spackle to dry, flip the blank over, and repeat the process on the other side. Just add a bit more water to your old spackle mix and it should be ready to go again. Once the spackle is dry, you can lightly sand the entire blank with a soft sanding pad and 220 grit sanding screen or sandpaper.

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