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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...
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.