prepping a bumper for respray

[qikteg]

to replace my cracked stock bumper, i've picked up one from the wreckers in fairly good nick, just in a different colour.

i want to sand it back and prime it ready for a respray, just not sure what sort of sand paper i should use (ie wet/dry, grit, etc etc)

then do i just use bumper undercoat?

i've also got a fibreglass lip waiting to go on, its just in the gelcoat... should i sand back using same or different?

[mattchuej8]

how much did u get your stock front bumper for?

[qikteg]

picked it up for $75 at the wreckers including indicators.. not a bad score i reckon. couple of scratches which i guess i'll just sand out, nothing that needs bogging i reckon

[phantom_civic]

Use 800 grit wetordry sandpaper.
Wet sand it until its dull and any chip marks or imperfections.
Only Prime it if u have bogged it.

[slowly]

Use 800 grit wetordry sandpaper.
Wet sand it until its dull and any chip marks or imperfections.
Only Prime it if u have bogged it.

800 is ok, wet/dry p1200 will gives a better result

[phantom_civic]

800 is ok, wet/dry p1200 will gives a better result

:thumbsup::thumbsup:

ops forgot to mention sumtimes 800 leaves scratch marks if rubbed to hard LOL

[qikteg]

shouldn't require any bogging.. thanks!

can the same grade be used for fibreglass gelcoat?

[mattchuej8]

wow thats cheap as!
good catch aye.

and thanks. :)

[qikteg]

to use a low grit like 600, wat would i need to do to make sure the sand marks don't show up? any special methods etc?

[v-tec power]

does the bar have stone chips or anythin like dat ? if so u dont 800 wet u must feather out any imperfections first then primer it or hifill it . then u rub it with 400 wet then 800 wet if u get scratches wif ur 800 u can use 1200 otherwise if good go over it with matting paste and grey scotch bight if u wanna make sure u get it all rubbed good . then u prep sol it and paint it .as 4 ur bottom lip rub the gelcoat wif 180 then 240 highfill it then rub wif 400 and 800 and paint it

[jdm_b16a]

You don't have to prime a bumper that has been previously painted. Just sand smooth, apply some primer and then paint.

Peter