Lap Line Help.

General Discussion
1

I am not sure why… But I sometimes get small pin holes / bubbles along the lap line on the deck. I am using a small roller to push the lap flush into the foam, and then basting with lam resin before laminationg the deck. They only appear after hot coating. Does anyone have any ideas why? or a way to avoid it?

Here is a photo to show whats going on.

http://s87.photobucket.com/user/wbacrf/media/lap.jpg.html

Cheers Jeremy.

2

Hi Jeremy, Is this the picture you wanted? Nice looking board! -J

3

After you baste the seam are you sanding it?

Here are one of two things that I would look for.

  1. If you arent sanding and just putting cloth straight over you may have little high spots (very small points yhat will poke the glass) that are creatimg an air bubble between the baste and the deck lam.

  2. If you are sanding… then the air bubble is probably in your baste coat. They can be hard to see if they are real small and when you sand you are popping them and filling them with sanding dust. When you glass the deck the dust doesnt saturate and your left with a bubble you likely wont see until you glass.

Whatever I sand I wipe with acetone to see what it will look like once its wetted out.

You can try thinning your base coat a little bit with styrene to get it to flow better and seep in.

Also do they pop when you sand the hotcoat?

4

Are you cutting the lap with the razor blade vertical, or horizontal.

If you cut straight down into the foam,

you are creating a void to either fill with resin,

or will fill with air.

Fold the lap up and cut with razor blde sideways.

Bending the blade helps.

Some people like to both cut the tape for laps,

then use the cutter to cut fiberglass.

This creates a wide cut in the foam.

5

Thanks for the replys. That is the photo thanks jrandy!

I am just basting the laps with lam resin, so no sanding before putting the cloth for the deck down. So it could be small high spots creating the problem. I am not 100% sure but it kind of looks like they may be open already before sanding.

Cutting the laps with how you have described Barry with a horizontal blade and folding them up. I guess I can only keep trying.