I finally built a watercolour paper soaking tray after 10 years of using the bathtub. Ugggh!
All it took was a piece of 1/2" plywood 24" X 36", 6' of 1X6 Spruce board, "Goop" plumbers adhesive, "Dap, Kwik Seal", 1" finishing nails, a few 1X6 wood screws, acrylic primer,
and a quart of marine paint.
I first cut the 1X6 spruce into 2" wide strips. The left over pieces were about 1.5" wide
which i ripped in half and used on the underside of the plywood for a nailing strip.
These were glued on and nailed.
The 2" strips were then attached to the sides with adhesive, nails
and a few wood screws to keep them snug.
The next step was primer followed by one coat of marine paint.
When this dried, (24 hours drying time)
i caulked all the joints in the well with the Dap followed by a final coat of marine paint
applied quite thick.
Voila! A soaking tray which will handle a standard size watercolour sheet
22" X 30".
Can't wait to try it.