How is that cheaper or quicker than putting down a 36" wide strip of 751 cast?
Material cost - 36" x 16' x 2 pcs - about $50 or so ??
Time to install - about an hour TOPS
With a conservative shop rate of $60 an hour, painting it like you said would cost $170, vinyl would cost about $110, plus it can be removed in the future much easier if the customer decides to sell the trailer.
Okay. You want it right out here where all your friends can see this.
751 - 48" - 10 yard roll is $130 or so.
You need two rolls.... one black & one white for $260.
You now have to cut it down to 36" leaving a lota waste.
Now it's cut and for the most part, cast will have application tape on it. Add in whatever you think 40" x 35' of tape is gonna cost to it.
Prep your sides then rub down with alcohol.
Make your tick marks at 36" and put the first side down.
Do all of this all over again.
Are you gonna have any bubbles using cast ?? Probably.
Now cut out your white copy, weed it, tape it, line it off and apply it.
You're gonna have over $300 in it with materials alone, plus your prep time, application time and the lettering time which will be the same on vinyl or paint. You're really gonna just about max out his $500 budget.
My way will involve less then $50 in supplies for black and maybe $145 for the white copy portion. A whole lot less and maybe two hours tops in making it all black and completely bubble-free and actually last probably easily up to 10 years.
Your theory is wrong because you're using shop costs and then hourly retail costs. The OP wants
HIS costs.
So it's less then $250 for mine, while yours will be around $400 to $450. Double my method for a trailer that is old and beat up as described. Why worry about resale on old equipment ??