My client is doing a show - and wants to put signs outdoor 4' by 8' - they have some metal stands with clips etc. - they currently use 10 mm corrugated plastic with a print on both sides and secure these signs to the stand. These signs are out there for 4-6 weeks max - in April - so need to withstand rain and some wind at times. They do not want any permanent sign - because some go on hard surfaces by the sidewalks, some on divider with soft ground. They later store it for future use. Any recommendations.