We’re a small business in Canada (Ottawa, On. area) and do mostly residential but we are interested in growing and have been invited by the city several times lately to bid on jobs. We have done 2 graffiti removals for them which went well.
I’m preparing to bid on a project for the city, larger than we’ve ever done and i’d like some input and practical advice as we’re already very busy and I’m only interested to do this if it goes relatively smoothly and is really worth the hassle.
The project consists of erasing a painted line on the sidewalk/street/crosswalks that has been painted on, a year ago, as part of an ``artistic’’ thing. It is red acrylic paint. It is 6 inches wide and about 3.2km /1.8 miles long.
I have already sent a bid earlier this summer and there was only one other contractor bidding. He won it but now he has not been able to get the paint off with satisfactory results so the city is asking for bids once again. This other contractor is a 78 year old gentleman that has been doing this for 30 years and has all the best equipment so if he couldn’t get it done i’m really scratching my head on how it can be done. I plan on bidding plenty high to allow for unexpected problems that will arise. I expect to rent or buy equipment and will factor this in the price. The line crosses streets and sidewalks and the work must be done at night. Some areas are asphalt, but a lot are concrete or interlock.
So far as a test I have tried pressure washing (4000psi/4gpm with turbo nozzle) with good results on asphalt but barely does anything to the paint on concrete or interlock. I plan on doing a test with a wet sandblasting kit and also try a scarifier. Are there other options that exist and would likely be approved by the city (environmentally safe etc). Keep in mind this line is downtown in the city.
There are also 7 pieces of ‘’‘art’’’ on the asphalt/concrete/interlock that have been painted with the line and need to be priced separately. Probably 200 sq feet on average each.
So, what would you recommend to remove this paint efficiently, with satisfactory results and without damaging the surfaces? The other contractor used high-end sandblasting equipment but the city did not approve the results.