5 replies to this topic

[olly33]

I have done some filler work and added high build primer over the top after sanding down filler. There are still parts that need a bit of putty filler or proper filler.
Can anyone tell me the best way to go about this and the next procedures.Also will high build primer be enough on the car until its sprayed shortly.
Cheers

[Daz1968]

I used upol gold to fill any imperfections after filler, only primer that would protect against moisture is epoxy, block sanding filler is best way and would show up any problem areas especially if you use a guide coat. I wouldn't have used any high build primer until satisfied all filler is sanded down correct. If car is in a dry environment then high build may be ok but it's like a sponge to moisture.

Edited by Daz1968, 26 March 2015 - 06:34 PM.

[AlexMozza]

You can get Knifing putty, designed to fill in slight marks and where the paint might sink into scuff marks etc. 

[olly33]

So could i add a cheap primer first and a black guide coat on top afterwards, then block sand filler/knife putty.
If i still have imperfections, fill and sand again, then can i add high build primer once i am happy with the finish or will epoxy be better then high build?
Cheers again, Olly

[Daz1968]

I found knifing putty being cellulose base sank and upol gold was much better being a 2k product. Dolphin glaze is another good one to use.

[Ben_O]

The best tool for checking filler repairs are your hands. Take plenty of time when sanding repairs and feel you repairs constantly checking that everything is even and true. If you have low spots that cannot be brought to level with more sanding, then apply another layer feathering it over the top of your previous effort. Keep going until the shape is right.

If you finish your filler repairs with a 320 grit then your primer coat will need less work.

 

As above, there should be no reason to apply a primer until the repairs are how you would expect them in a finished state as even high build primers will only help with very minor imperfections like light scratches.

 

Just remember, the whole point of guide coating and blocking high build is to even out the primer, not the repairs beneath.

 

also, don't be afraid to guide coat your filler when you are in the final stages of flatting it off as this will be perfect at showing up deep sanding scratches and imperfections before you prime meaning that there will be no need to add more filler or stopper on top of the primer in the final prep stages.

 

Putties and fine stoppers are good for minor imperfections but i personally don't see the need if your repairs are right first time using a good quality filler.

 

Be patient, sanding filler is boring and it is so easy to take your eye off the ball when sanding and take too much away so concentration is very important.

 

Cheers

 

Ben