Interesting one... most exterior products are gloss because they last
better outside - more water resistant etc....
You may like to check out the matting additive....
donno if it will work in your particular paint..you may just have to
try it.....as the manufacturer probably won't recommend using it in
anything that they haven't tested it in, just in case it all goes
The other method is to put your trailer out in the sun and wait... the
paint will loose gloss with time!!!!
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