Hi guys, thought this question is asked quite a lot so thought i'd put myself together a little guide on how to make your bumper strips gloss black.
it was a rather quick guide on a spare bumper so please dont judge lol.
Step 1 (preparation):
1st off before you do anything you need to prepare yourself and the bumper.
what you need:
Plastic Primer.
Gloss black/Black spray paint.
Lacquer.
Sandpaper varies from 120-1200.
Masking Tape.
A Bumper.
Tape up the bumper around the black strips so no paint is going to go on the bumper. use as much or as little as you need depending on how accurate you are.

Step 2 (sanding):
so we now need to sand the bumper, for this is used 120gritt (due to the condition of the bumper) but if yours is smooth then i'd recommend around 240gritt.

once its sanded it should look something like this.

once that is done, wipe down the surface to remove any particles, as this will affect the outcome.

Step 3 (priming):
we now need to prime the bumper using our plastic primer. i recomend 2-3 coats of primer, sanding in between.

using the primer, spray the designated area.

after that has tried (around 15-25min) sand it down using 400-600gritt.

continue this until you are satisfied.
Step 4 (spraying):
once that has fully dried, we now need to spray the bumper using your chosen paint. (i only used some cheap black paint for the guide)

leave to dry in between coats (30-45min) i would recommend around 2-3 coats, but thats up to you.

once your are happy with your job. leave a further 1hour for it to completly dry.
Step 5 (lacquering):
once it has dried we now need to apply lacquer to the bumper to give it a more shiny effect and chip resistant strength.
apply the lacquer across the bumper strip, i would only say 2coats for this.
once that has been sprayed leave overnight to dry. heres the outcome (note this was rushed so not perfect job):

Hope that helps. please comment on your thoughts.
it was a rather quick guide on a spare bumper so please dont judge lol.
Step 1 (preparation):
1st off before you do anything you need to prepare yourself and the bumper.
what you need:
Plastic Primer.
Gloss black/Black spray paint.
Lacquer.
Sandpaper varies from 120-1200.
Masking Tape.
A Bumper.
Tape up the bumper around the black strips so no paint is going to go on the bumper. use as much or as little as you need depending on how accurate you are.

Step 2 (sanding):
so we now need to sand the bumper, for this is used 120gritt (due to the condition of the bumper) but if yours is smooth then i'd recommend around 240gritt.

once its sanded it should look something like this.

once that is done, wipe down the surface to remove any particles, as this will affect the outcome.

Step 3 (priming):
we now need to prime the bumper using our plastic primer. i recomend 2-3 coats of primer, sanding in between.

using the primer, spray the designated area.

after that has tried (around 15-25min) sand it down using 400-600gritt.

continue this until you are satisfied.
Step 4 (spraying):
once that has fully dried, we now need to spray the bumper using your chosen paint. (i only used some cheap black paint for the guide)

leave to dry in between coats (30-45min) i would recommend around 2-3 coats, but thats up to you.

once your are happy with your job. leave a further 1hour for it to completly dry.
Step 5 (lacquering):
once it has dried we now need to apply lacquer to the bumper to give it a more shiny effect and chip resistant strength.
apply the lacquer across the bumper strip, i would only say 2coats for this.
once that has been sprayed leave overnight to dry. heres the outcome (note this was rushed so not perfect job):

Hope that helps. please comment on your thoughts.
