Product over load paint guru help please

[tb8125]

I have a 87 camaro the front bumper has been 3 full time (primer, sealer base, clear 3 different paint jobs) I have some very serious web spieder cracking allover the bumper I have sanded all the way to the raw plastic bumper and I can still see the cracking and webbing.... Today I went to the paint store and bought a few things
1 sem ready to sray flexible primer surfacer
2 bulldog adhesion promoter...
3 DuPont flex additive


My plan is to strip entire bumper ground effect ect...(used 80 grit and a da) To bare plastic
Clean and prep then use the bulldog adhesion promoter then the sem flex primer then base then clear using flex additive....


Is that too much can the job to done with less steps and less product... Or am I wasting my time doing all of the cause the crack are just going to come right back


https://static1.pt-content.com/images/pt/2013/09/52CD1875FF48414E8B75C2E6A12F96B249500000-1.jpg


https://static1.pt-content.com/images/pt/2013/09/A63C1A73380F4403A58FA44B5F56B0EE49500000-1.jpg
After bumper after sanding with 80

https://static1.pt-content.com/images/pt/2013/09/7DEE87CC5EC640BA8A0077F2A19924C349500000-1.jpg
Before sanding untouched area

[sccacuda]

I'd recommend a two component primer instead of the single component rattle can. I'd also stick with one product line from ground up. We only use Dupont (Axalta, can't get used to that) and they make excellent plastic repair/paint systems. If you need a recommendation on PN#s, just let me know.

[elitecustombody]

Keep sanding or the cracks will show up in new paint. I agree Craig. Use catalyzed primer,not rattle can stuff.

[tb8125]

I returned to sem rts flexible bumper primer.... I have been painting with DuPont nason products for the last 2 of my projects.... Nason has a 2k primer that I can use and add the DuPont flex additive... Not sure if will work with the nason line tho....

https://static1.pt-content.com/images/pt/2013/07/null_zps0f894463-1.jpg

https://static1.pt-content.com/images/pt/2013/09/797590EAF9AC4168A0CA829C41A9894631000000-1.jpg