How much weight is added when painting foam models?

[Chuck Baker]

Noel Mortier shared the following analysis...

I was curious how much weight paint adds .
I've been playing I made a spreadsheet of weight increase when applying finishes.
I used a 12.9sq in piece of foam. I weighed  it bare and after each coat of brushed minwax poly . then after each of 2 coats of spray rustolem 2x paint.

I then calculated the increase for each step in grams and grams per sq in.
Some of the measurements were also mage in grains . there are 7000 grains to a pound.

The weight of each step and total for the planes as well as the % increase for a night timber and a t28.
I used 3x wing area as a rough approximation of total plane area.
It  looks like 2 coats of minwax and 2 cods of 2x increase weight of night timber 4.5% or 74.8 grains
T28 3.48% or 54.75 grains.
I reweighed it after the second coat of paint fully dried like all the other steps. It looses weight as the solvents evaporate.

Thought you might find it interesting.

Noel Mortier
317-696-1212