That depends on several factors… Let me explain.
Traffic: If you have a job on a driveway and the customers have kids and both kids have their own cars as well as mom and dad having 2 cars, I would upgrade to the 200 or 6000. By the same token, commercial driveways should automatically get 200 or 6000.
Weather: If it”s the rainy season where the chances of showers are strong and you have to get a coat of sealer on the job or stand a chance of losing it or it getting damaged, I would drop back and use the 150/155. If the 150 or 155 gets wet before it’s totally cured it will haze white. The second coat of 150 or 155 will 99% of the time pull the haze out and it will look great. However, if the 200 or 6000 gets wet before it is cured it too will haze up white but you will have to grind the job down to get it off and then start over.
Chemicals: If you’re selling a job and there are lots of solvents or chemicals being used, you will need to upgrade from 150 or 155 to 200 or 6000. For example automotive repair centers: Brake fluid, transmission fluid, battery acid, etc. And, keep in mind that some folks still do heavy repairs on their own cars at home. They need 200 or 6000 as well.
So here are some examples where you might want to upgrade from 150/155 to 200 or 6000:
1. Heavy traffic
2. Lots of chemicals
3. Customer looking for a lot of sheen
Here are some examples when you might have to step down from 200 or 6000 and use 150/155 on outside jobs.
1. Strong chance of rain getting on the job before 200 is cured.
2. Have to put sealer on late evening and they”re expecting dew.
3. Foggy outside.
Keep in mind you can NOT put 200 or 6000 over 150 or 155 or 150/155 over 200/6000 they are stand alone sealers.