Another data point for the historic 4oz vs 6oz debate; did some acrylic paint testing for some board artwork and also experimented with the lam sched. I took a piece of EPS foam and cut it into two 12”L x 6”W x 3”Th “blanks” and sealed both with RR epoxy/Q-cell mix. Starting weight for both was 3.6 oz. Weight gains (measured on a digital food scale) were as follows:
After glassing the bottom: 1x6 +0.7oz, 2x4 +0.9oz
After glassing the top (did all layers in a single lam): 2x6 +1.5oz, 3x4 +1.6oz
Fill coat the top: 6oz +0.6oz, 4oz +0.5oz
Total gain (note - did not fill coat the bottom): 6oz +2.8oz, 4oz +3.0 oz
End weight: 6oz 6.4 oz, 4oz 6.6 oz
Note that the weight of a pencil is about 0.1 oz.
Based on the data above, a very rough projected final weight estimate for a 6 ft board is about 6.5lbs for both glassing schedules, probably within ¼- ½ lb of each other, not including laps, fin boxes, gloss coat.
On the artwork; my trusty assistant painted flowers with acrylic craft paint on rice paper which after being allowed to thoroughly dry (2 days) was then roughly cut out around the artwork and inserted during the lam process under the top layer of glass after wetting out the bottom layer(s). No bleeding of color and the paint thickness from the brush work did not interfere with lamination. The advantage to this over just painting on the board is the ability to paint on paper; mistakes are more easily fixed (just re-do), and the artwork can be done ahead of time prior to the board lamination tango.
Hope that helps, I’m totally in the 4oz camp now btw.
