Etching vs epoxy primer questions

377 · Apr 18, 2018

I'm getting ready to prime my roll cage in my current project and had some questions. I have been reading through some posts and am kinda confused should I etch prime the roll bar or just use epoxy primer. After spraying either of those should I use a primer sealer then final paint? While I'm here I have another question I also need to paint the interior of my fiberglass tub it is gel coated. Do I just sand the tub to help adhesion and then spray with a primer sealer. What grit paper should I use? I have never painted fiberglass so I figured I'd ask here because I've Lways gotten great help here. Thank you in advance for your help.

rjrobin2002 · Apr 18, 2018

You just need to make sure your primer is rated for on the label " DTM". I have a multi purpose primer that can mixed as a high build primer, just a base DTM primer, or a sealer. But DTM is a auto paint term that means Direct To Metal which your cage will be bare metal. Scuff the cage with a 400 grit and degrease. I recommend shooting your primer, wait 1 hour and shoot your paint so you don't have to sand your primer before paint. Roll cages suck to sand and clean, plus shooting the paint 1 hr after primer is sprayed gives you best adhesion.

rjrobin2002 · Apr 18, 2018

Like this one

http://www.tcpglobal.com/SEM-ML014_5.html?sc=115&category=11322545#.WtfzoXNOnqA

rjrobin2002 · Apr 18, 2018

And yes on fiberglass, I use my DA sander and scuff it all with a 4-600 grit, degrease, then shoot the same type primer above mixed as a high build, spray a few coats, block it out, re shoot the same primer mixed as a sealer and then do paint one hour after the sealer is shot.

377 · Apr 19, 2018

Thank you for the answers on my questions. I did a search on the TP Global site but only found hardner for that primer. Your answer and their description makes me think there is something you mix in to make it a primer sealer? Thanks again.

Rustytruck · Apr 19, 2018

Here's the tech data sheet on that particular product.

https://www.semproducts.com/manage/...ts/sem_tds_metalock_dtm_high_build_primer.pdf

I do not endorse that product just supplying information.

377 · Apr 19, 2018

Thanks Rustytruck didn't realize it was as simple as adding a reducer. I know you said you didn't endorse this product. My only question would you spray your rig with it? I just want something that is a quality product and don't know anything about different paint manufacturers. Thanks again for your help.

Rustytruck · Apr 19, 2018

This is what I used on my Bronco. Both as a primer and sealer just before spraying color.
It gets thinned down for use as a sealer. this product worked very well for me.

http://www.tcpglobal.com/s.nl/it.A/id.226993/.f#.Wtke3vnwZD4

I have never used Sem primer so i can't endorse it. I have used their vinyl colors and they worked well.

rjrobin2002 · Apr 19, 2018

I have not used it either, but SEM is a good brand and it was the first multi use primer I saw on tcp global. I have used various brands and never had a problem. The key is read the product directions for what your doing, sand the base metal or fiberglass with 400 grit on a DA sander, wipe with a automotive degreaser and a tack cloth before shooting.

377 · Apr 19, 2018

Guys I really appreciate all your help with my questions it looks like I have two good options. Thanks again and take care

Etching vs epoxy primer questions

377

Sr. Member

rjrobin2002

Bronco Guru

rjrobin2002

Bronco Guru

rjrobin2002

Bronco Guru

377

Sr. Member

Rustytruck

Bronco Guru

377

Sr. Member

Rustytruck

Bronco Guru

rjrobin2002

Bronco Guru

377

Sr. Member

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